Rooftop scene (major spoilers!)
I can understand the filmmakers not wanting to depict Mathilde's death too graphically, but have her (apparently) leap while going back to fetch the puppy seemed ... clunky; the viewer has to pause & wonder what happened--did she slip, or succumb to a momentary impulse?
In reality I think quite a few actual suicides end with a sudden impulse even after hours or days of consideration. Still, this is a movie, not a documentary. The filmmaker can be direct or indirect as she chooses so as *she* knows the story she's telling.
This particular scene suggested, to me at least, that she wasn't quite certain how Mathilde died. It's okay to leave the audience wondering, & that was perhaps her intent, but I don't feel it quite came off in a manner even remotely satisfying.
Otherwise good movie...