At a constituency hustings on 5 December 2019, she was asked about an article she had shared on Facebook which suggested that people with learning difficulties should not be guaranteed a minimum wage.

[11] In December 2019, an inquiry was initiated by the Conservative Party into Hart after it was discovered that, in 2017, she had shared a video which contained the conspiracy theory that the Jewish billionaire George Soros controls the European Union.

Hart described the blog, in which Berens condemned the 2017 Women's March against US President Donald Trump as being used to promote a "Muslim agenda", as an "affecting read".

[15] Following an interim report on the connections between colonialism and properties now in the care of the National Trust, including links with historic slavery, Hart was among the signatories of a letter to The Daily Telegraph in November 2020 from the "Common Sense Group" of Conservative parliamentarians.

[16] In February 2023, the Hastings & Rye Conservative Association deselected Hart as its candidate for the next general election,[17] but she was reselected in a members' ballot in March 2023.

[18] Hart introduced a private members' bill to the House of Commons (Child Support Collection (Domestic Abuse) Act 2023) in 2023.

Hart was the chair, vice-chair or an officer of several all-party parliamentary groups including on special educational needs and disability (SEND), school exclusions and alternative provision, almshouses and wetlands.