[7] In May 2024, 3 days before the end of her term, Allan was suspended from the Conservative Party for publicly supporting the Reform UK candidate for Telford, Alan Adams.

[21] Allan was elected as a local councillor to Wandsworth London Borough Council in 2006, representing the Southfields ward, and served until 2012.

[22][23][9] In March 2013, she was selected as the Conservative Party parliamentary candidate to contest the marginal constituency of Telford in the 2015 general election.

[23][24] She advocated a direct rail link to London from the town[25] and aimed to tackle the high rate of youth unemployment in Telford.

[29] In December 2015 Allan was accused of bullying members of staff,[34] and leaving a series of voicemail messages to a sick employee allegedly including a threat of dismissal.

[37][38] Later in January 2016, Allan acknowledged sending the voicemails was "stupid" and she regretted shouting at the employee, but denied her actions amounted to bullying.

[41] In June 2016 Allan introduced a private member's bill to repeal provisions in the Counter-Terrorism and Security Act 2015 to require staff to report possible signs of extremism or radicalisation amongst primary and nursery school aged children, following a number of high-profile cases where the provision was inappropriately used in relation the government's Prevent strategy.

[43] In April 2019, Allan welcomed the "fantastic" candidates from the Brexit Party ahead of that year's European elections.

[44] She defended the comment after being criticised by some Conservative loyalists, saying that party loyalties would be "eclipsed" by the Brexit issue at the ballot box.

[49] Allan later apologised for creating a "misleading impression", and said the controversy was not about her use of social media, but due to "activists unhappy they didn't get the MP they wanted".