Sullivan has broken with Labour on the two most contested issues of this parliament. On the assisted dying bill, she voted four times against her party's majority position in June 2025 — backing amendments that would have blocked applications where the wish to die stemmed from feeling a burden, mental disorder, disability, or financial hardship, while rejecting a requirement to assess palliative care provision. More recently, in July 2025, she backed the welfare rebels by supporting an amendment to extend benefit protections to people with fluctuating conditions such as Parkinson's and ME — a position her party majority opposed. With 96.5% party alignment overall, these deviations are deliberate rather than habitual dissent.
She votes at 71% of divisions — below the Commons average — and her stance profile marks out two clear tendencies: strong support for workers' rights and housing development, but consistent scepticism toward parliamentary scrutiny mechanisms (18%) and the Lords' role in legislation (4%). Her party-deviation data reinforces the welfare and assisted dying breaks: she sits 47 percentage points below her Labour colleagues on pro-assisted-dying-access measures, and 24 points above them on disability rights protections. Economy, jobs, and health dominate her speeches, with social care and local government also featuring heavily.
Outside the chamber, Sullivan chairs the Endometriosis All-Party Parliamentary Group and has raised the issue at PMQs, securing a government commitment to further discussions; she has also introduced a private member's bill on inclusive PPE standards, citing constituent cases from firefighters and police officers. She sits on the Scottish Affairs and Administration Committees. Local coverage over the past 90 days is insufficient to establish a sentiment pattern, but recent stories have been consistently positive in tone.