Having commented earlier and read (most of ) the thread, I strongly recommend reconsidering violin as choice of instrument. Or at least giving it some serious thought. You say she wouldn’t stop asking for one, but what are her reasons and are they still valid?
I think it has to be ok to change instrument if it’s not working.
My daughter moved away from percussion because her gross motor skills were not precise enough. She then moved away from violin because it was difficult for her to coordinate 2 hands doing rather different things. She started playing wind which suits her much better, as she was playing on her line of symmetry and moved from one brass instrument to another because the size of mouthpiece suited her mouth/ lip shape better
She absolutely loved the percussion and the violin when she started, it just became clear that it was going to be frustrating to her. She had to accept she wasn’t going to be able to make that sound.
Watch her play, is she able to use the bow and get fingerings with any fluidity? How is she holding the instrument? Naturally or awkwardly?
I think you need to have the right physicality to go with an instrument, and genre of music too.
I think it has been a journey with my dd, but she has an understanding of the instruments she doesn’t play which helps her appreciate music better.
Good luck