Ugh, I hate everything that is disclosed in that trailer. Of course, I'd say that about any trailer for any movie I liked, but I especially say it about movies I especially like. I knew two words going into Raw and only one of them -- the word "French" -- wasn't a spoiler! :)
Unfortunately, nothing in the Q&A about Ducournau's background. But basically she's been working on Raw for the last six years, having done shorts leading up to that. Reading interviews with her, and hearing her talk about how she works, she sounds like someone with lots of experience. When asked about Raw coinciding with Get Out, she also brings up The Witch, The Invitation, and Babadook. She says she's really into Korean movies. So, basically, a filmmaker and moviegoer through and through.
By the way, Garance Marillier is a dead ringer for Rose Byrne.