Hopkins told Sathnam Sanghera of The Times in June 2015 that she applied to study Philosophy, Politics and Economics (PPE) at Magdalen College, Oxford, but was rejected at the interview stage. Disappointed, and putting the failure down to an absence of "a bit of coaching", she instead studied economics at the University of Exeter. She felt that her time at university was "redeemed" by her sponsorship from the British Army's Intelligence Corps and spent her weekends with the Officers' Training Corps. This she found "really fun, lying around in forests with guns having a brilliant time".
In 2015, she deliberately gained and lost 3 stone (42 lb; 19 kg) over the course of several months, in an attempt to show that obese people can diet successfully. Her progress was carefully documented by a camera crew and then played on a programme called My Fat Story for TLC. TLC claimed an audience figure of 10 million in the UK and US for the programme.
At a Church and Media conference in October 2015, Hopkins said she was "pushing back the walls closing in on freedom of speech". Describing herself as "Jesus of the outspoken" during her speech, she said: "I have never apologised for anything I've said. I find it very disappointing when people apologise. You should have the positive moral attitude to stand by what you say".
At the end of October 2013, it emerged that Hopkins had joined The Sun as a weekly columnist, with the newspaper promoting her as "Britain's most controversial columnist". In February 2015 Hopkins defended her remarks and those of her critics, commenting: "I welcome it because I've had my opinion and it's only right that people have theirs. I welcome the debate and the fact that people are getting involved."
In autumn 2015, she left The Sun for the Mail Online website, the online companion to the Daily Mail. The Daily Telegraph contributor Bryony Gordon wrote in April 2015 that media organisations have "a tipping point here, where the marketing men and women don't want to be associated with reality TV's very own Adolf Hitler. But so far that doesn't seem to have happened." The Mail published a front-page article in June 2017 expressing its low opinion of the liberal The Guardian newspaper, which had attacked it for its coverage of the attack on the Finsbury Park mosque and also referred to Hopkins. It "was a lie" to say Hopkins wrote for the Daily Mail, it asserted. "The Guardian and its writer know that Ms Hopkins has nothing to do with the Daily Mail, but works for Mail Online – a totally separate entity". The Daily Mail newspaper and Mail Online are part of the same group. Her last column for the Mail website was published on 5 October 2017. In a late November 2017 statement from her employers to the Press Gazette, it emerged that Hopkins's Mail contract had not been renewed "by mutual consent". A large number of Tweets from her Twitter account were deleted around the same time.
Hopkins objected to Rochdale commemorating National Pakistan Day on 23 March 2015 and said that she based her objection on a Rochdale sex trafficking case involving nine predominantly Pakistani men and forty-seven white victims. In a series of tweets, she posted images of the felons with the caption "are these your friends too?" On 29 March 2015, Hopkins was reported to the police by Labour MP Simon Danczuk for possible race hate crimes. In response, Hopkins said: "I asked fair questions and I think it's important that someone has the balls to speak out".
On 17 April 2015, Hopkins wrote a column in The Sun comparing migrants to "cockroaches" and "feral humans" and said they were "spreading like the norovirus". She wrote that gunships should be used to stop migrants from crossing the Mediterranean. Her remarks were condemned by the United Nations High Commissioner for Human Rights, Prince Zeid Ra'ad Al Hussein. In a statement released on 24 April 2015, he urged the UK to "curb incitement to hatred" by its "tabloid newspapers". He stated that Hopkins used "language very similar to that employed by Rwanda's Kangura newspaper and Radio Mille Collines during the run up to the 1994 genocide", and said that both media organisations were subsequently convicted by an international tribunal of incitement to genocide.
In 2015 a Change.org petition was initiated with the aim of getting The Sun to sack Hopkins. By 26 April, it had attracted over 310,000 signatures. In early September, The Sun retweeted an earlier comment from Hopkins expressing her disinterest in migrants. The tweet was pulled after the Prime Minister David Cameron publicly announced Britain would do more to help those seeking asylum in the UK. A further Change.org petition for Hopkins to be replaced with 50,000 Syrian refugees gained more than 20,000 signatures in less than 48 hours in September 2015.
In November 2015, Peter Herbert, chair of the Society of Black Lawyers, reported Hopkins and The Sun to Sir Bernard Hogan-Howe, the Metropolitan Police Commissioner. Hopkins was questioned and not charged, and subsequently criticised the police for purportedly criminalising opinion, and stated that she would set up a Society of White Lawyers. By December 2016, the original article had been removed from The Sun's website.
Mohammad Tariq Mahmood, his brother and their children were stopped from boarding a Norwegian Air flight from Gatwick to Los Angeles on 15 December 2015. At the airport, the family from Walthamstow found their entry visas to the United States had been cancelled.
In September 2015, Hopkins spoke at an event organised by the Electoral Reform Society at the UK Independence Party (UKIP)'s annual conference. After derogatory comments about the appointment of Michelle Mone to the House of Lords, she said: "Frankly, I don't really mind if we seal up the room and gas the lot of them".
UKIP said in 2015 that Hopkins was not a party member and, although she has reportedly applied to join on several occasions, her applications had always been rejected.
In November 2015, students at Brunel University turned their backs on her, then walked out in protest at her presence in a debate.