I don't see any tracing from this at all, honestly. The most I could see is maybe being inspired by the form and then drawing her own.

It's perfectly possible to grow in skill without posting art all the time (if she doesn't live with you anymore, how do you know she's not doodling in her spare time or studying anatomy on her own?), I feel like I've done this myself.

It seems a little grudgy, especially since most of the art she drew seems on par with the art you posted saying that she didn't copy/trace it.

It also doesn't seem to make much sense, to make major anatomy mistakes when she could just trace the artist's lesser mistakes instead. :P