Sullivan broke from Labour three times on the assisted dying bill in June 2025, voting against both the final Third Reading and a key amendment tabled by the bill's own sponsor — placing her among the minority of Labour MPs who opposed legalising assisted dying. She also voted against an amendment requiring palliative care to be assessed in the law's first annual report, and backed two tightening amendments that her party rejected. Her deviation from Labour's majority position on assisted dying access stands at 44 percentage points, the sharpest gap in her voting profile. Locally, she has led sustained campaigning to restore the Gravesham ferry service, linking it to Lower Thames Crossing toll revenue — a push that drew BBC and Kent Online coverage and secured a response from the Chancellor.
A 97.9% party-line voter overall, Sullivan participates at 87% of divisions — close to the Commons average. Her stance scores flag consistent loyalty to fiscal responsibility and workers' rights, but low alignment with parliamentary scrutiny (16%) and Lords oversight (0%), suggesting she follows the government whip on procedural matters. Her speeches concentrate on economy and jobs, social care, health, and local government — a profile that tracks her constituency priorities rather than any single ideological specialism. She sits on the Science, Innovation and Technology Committee.
Sullivan holds a doctorate, though the subject is not specified in available data. Her news coverage over the past 90 days spans 59 articles, led by crime, community, and transport stories, though sentiment scores are neutral — reflecting volume rather than controversy. The assisted dying votes are the clearest signal of independent judgement in an otherwise loyalist record.