Levavasseur was an early participant of the
yellow vest () movement. She soon emerged as one of the more visible faces in the group. Levavasseur became involved because her low income meant she could not afford any unexpected expenses including rising fuel costs. She appeared three times on
TF1 by 8 December 2018. She was one of three yellow vest activists from
Eure to appear on the network. She also appeared on
France 2 once during a 55-minute presentation on a special that included
Laëtitia Dewalle. On 27 November 2018, she was one of six yellow vests activists to participate in a
LCI program called
The Great Explanation (). On it, she showed all her bills to explain how the tax increase would negatively impact her as someone who lives paycheck to paycheck, earning just a bit too much to qualify for social benefits. On 24 December 2018, she signed a
petition in support of
Eric Drouet, who was in
police custody at the time. In late January 2019, she was being described by the media as a representative of the movement. She was offered a position as a columnist at
BFM TV but later changed her mind after being subjected to a large number of threats of physical violence on social media for the decision. Initially accepting the role lost her a lot of credibility within the yellow vest movement. Compared to other figures in the movement like
Maxime Nicolle,
Priscillia Ludosky, or Eric Drouet, Levavasseur had a much smaller social media following in late January 2019. Nicolle called Levavasseur's involvement in the movement as being completely about personal opportunism, saying on 24 January 2019 after her announcement of Citizen-Led Rally: "You are taking the piss out of I do not know how many people. [...] Opportunists [...]". Levavasseur responded by saying: "We just do not agree on how to lead the movement, but it does not matter, everyone has the right to fight in their own way". During Acts XIII and XIV, she faced continual harassment and threats from other activists for her attempts to politicize the movement and draw attention to herself as an individual. Levavasseur found this difficult to deal with, especially given her employment situation. On 17 January Levavasseur was at a rally in Paris, where other yellow vests in the crowd shouted sexist and violent abuse at her. Some gave her the middle finger, and yelled abuse including calling her "dirty whore". Some also screamed she should "take off your dirty slut vest". Following Act XIV on 16 February 2019, in response to
antisemitic acts during Saturday's march in Paris, there was an open letter asking
Priscillia Ludosky,
Jacline Mouraud, Levavasseur, Drouet,
Maxime Nicolle, and other yellow vest spokespeople "to condemn the aggression committed against Alain Finkielkraut and the anti-Semitic remarks of which he was victim". On 18 February, Levavasseur announced on her Facebook page, which has 13,000 followers, that she was going to file a
police report over the hatred directed at her during the 17 February 2019 march. ==Citizen-led rally==