Pomme

She's playing a Pocket Piano MIDI throughout the video.

She's seen using a Yamaha Reface CP synth in her last live performances.

In the "Petit Concert: Pomme" video by Sourdoreille, Pomme can be seen using the Novation Mininova synthesizer. Notably, the pitch bend is positioned directly to the left of the keys, distinguishing it from the Launchkey model. Special thanks to Andreleme for pointing out this detail.

Pomme's album Les Failles was accompanied by the 'Dans ma tête' series of short YouTube videos providing some background on each track. In #6 she mentions her use of the Omnichord to record the song "Pourquoi la mort te fait peur".

Shown very briefly in the studio with her and Albin de la Simone (source picture is a screenshot taken at 00:52 in the video), it looks like an OM-27 model based on the graphics around the chord buttons. Her explanation in French translates as:

I absolutely wanted Omnichord on there. It's like an autoharp but electronic, and it has a toy sound. I imagined it like a rain of flowers on the chorus. It's very corny but it works well.