I love that you are trying to help out your girl enjoying a toy still.
while I have no personal recommendations- I'm sure others might- I frequently use The Natural Bird Company who make toys and things for all sorts of birds.
The best thing about them? They help special needs birds and will help make something to your requirements, so that if you have some ideas of what might be ideal for your budgie, but no one sells, if you can describe it or sketch it, there's a chance they can make it.
Might be worth asking, anyway. here the link: Remedial solutions for parrots with special needs and disabilities