Riley's identifies herself as of Jewish heritage and as an atheist. Since 2018, she has campaigned against how the Labour Party has handled allegations of antisemitism. In September 2018, she said she had been called "Tory, brainwashed and thick" for criticising Jeremy Corbyn over the ongoing antisemitism row, but stated she did not have "any party loyalties". In January 2019, Riley made a speech at a Westminster reception for the Holocaust Educational Trust and addressed what she described as the "hideous abuse" she had received. In February 2019, it was reported that she had been involved in talks to set up a breakaway Labour party. In the same month, Riley and fellow campaigner Tracy Ann Oberman instructed a lawyer to take action against 70 individuals for libel or harassment. According to Jewish News, Riley has also been involved in the Stop Funding Fake News campaign which, she says, is aimed at making it "less profitable to spread hate, racism, misogyny, antisemitism, Islamophobia and their bedmates". The campaign has targeted Westmonster, since closed, Canadian site The Rebel Media, the left wing sites, The Canary and Evolve Politics, and other news sites by promoting an advertising boycott.