She then worked as a psychiatrist in a specialised clinic, before taking up managerial positions, first for SAMU Social and then for the private medical group Sinoué.

[13] In April 2018, Wonner joined other co-signatories around Sébastien Nadot in officially filing a request for a commission of inquiry into the legality of French weapons sales to the Saudi-led coalition fighting in Yemen, days before an official visit of Saudi Crown Prince Mohammed bin Salman to Paris.

[14] In July 2019, Wonner decided not to align with her parliamentary group’s majority and became one of 52 LREM members who abstained from a vote on the French ratification of the European Union’s Comprehensive Economic and Trade Agreement (CETA) with Canada.

[15] In May 2018, Wonner co-sponsored an initiative in favour of a bioethics law extending to homosexual and single women free access to fertility treatments such as in vitro fertilisation (IVF) under France's national health insurance; it was one of the campaign promises of President Emmanuel Macron and marked the first major social reform of his five-year term.

In late 2019, she was among the critics of the government's legislative proposals on immigrations and instead joined 17 LREM members who recommended, in particular, greater access to the labour market for migrants, but also "specific measures for collaboration with the authorities of safe countries, such as Albania and Georgia, in order to inform candidates for departure, in their country of origin, of what the asylum application really is.