She is the daughter of Patricia Sullivan, the politically influential founder of a local grassroots "tea party" group. Both mother and daughter are Republicans who identify as Christian Conservatives. Sullivan's parents home-schooled her. Sullivan still lived with her parents, at the time of her 2014 election.
In 2015 Sullivan sponsored an anti-abortion bill.
- Stephen Hudak (2014-08-30). "At 23, she's youngest woman elected to Florida Legislature". Orlando Sentinel. https://www.orlandosentinel.com/news/breaking-news/os-jennifer-sullivan-youngest-legislator-20140830-story.html. Retrieved 2019-09-26. "Jennifer Sullivan, who was 15 when she organized a Lake County 4-H project that gathered more than 3 tons of peanut butter for Central Florida food banks, will become the youngest female legislator in Florida history and the youngest of any gender since 1996, when Adam Putnam, then 22, won his first statehouse race."
- Jessica Weiss (2015-05-08). "Florida's New 24-Hour Abortion Wait Period an Expensive, Pointless Intrusion, Advocates Say". Miami New Times. https://www.miaminewtimes.com/news/floridas-new-24-hour-abortion-wait-period-an-expensive-pointless-intrusion-advocates-say-7602611. Retrieved 2019-09-26. "Rep. Jennifer Sullivan, a Republican from Mount Dora, is the pro-life 23-year-old sponsor of the house bill. She thinks women are rushed and often 'coerced into the decision.' Sullivan, the daughter of North Lake Tea Party founder Patricia Sullivan, just finished her first legislative session. She campaigned last year on a platform of less government and more personal responsibility."