It almost sounds like she needs an art mentor, rather than someone to teach her different mediums and techniques. When I was a child, that was my mom (she's an artist too). I also used to draw, but I never went through what you're daughter is going through because my style was realism, so as I got older I became more and more comfortable (I was lucky
).
It's a tough call with piano lessons for your daughter... I don't regret putting my daughter in lessons, but I wish it hadn't been so "black and white" for her: creativity Vs. technical learning. This was not her teacher's fault at all - she was very flexible and fun (we love her!) but my daughter is just black and white by nature.
On the one hand, composing is very creative, and if you have an ear, you don't need the technical knowledge to help you create. On the other hand, the ability to transcribe what you've written onto paper is very useful, as is the structural & technical exposure you'd get from studying other compositions.
I took a novel writing course (I'm back to writing, but there are so many parallels, lol), and one of the things we were taught was to not edit as we create (activity in your internal "editor" can stifle creativity, because they're two different cognitive functions that don't work together). So the goal would be to create first, just go with the flow, then edit later.
(I wonder if this is what's happening with your daughter's drawing - as she's maturing, the "editor" in her brain is developing and conflicting with the "artist")?
All three (visual art, writing, and music) seem to have that same conflict between the artist and the editor. The trick is being able to tell the difference and be able to switch back and forth when you need to, which can be tough for adults, let alone kids.
The bottom line, I think, is to maintain the joy. It's good that she's excited about the art camp - it could provide the fun and inspiration that she needs
