There are injuries that could cause stumbling, but what you're feeding her will definitely cause those things, and it will only get worse unless you can get her proper food. I mentioned rehoming her because if she can't get proper feed, she will die.
The human protein powders will help with the protein, but a quail needs more than just protein.
Here are the nutrition labels from a couple of brands that I use.
What you're feeding them is definitely not good for her, and very likely to be causing her health issue.
A lot of game bird feeds have soy for protein, but you'd have to check the ingredient list for wheat.
If you can't find an appropriate feed that you can tolerate, you might want to...