In tumors that first present confined to the optic nerve (as, it seems, is the case with your daughter) very infrequently extend into the optic chiasm (the brain area)and almost never form distant metastasis.
This is a good thing.....
What is recommended for treatment? Some doctors recommend removing the lesions via surgery, which causes blindness
but can leave the eyeball intact for cosmetic purposes. Others feel that chemotherapy and/or radiation can stop the growth of the lesions and address any proptosis (which you said your daughter has)
I must warn you. If the lesion moves into the optic chiasm area of the brain significant loss of function with up to 50% mortality rates in some reports.
What should you do? Exactly what you are already doing. Get early answers, find a doctor or team of doctors who you trust and keep on top of things.
To answer your question directly. It is very unlikely that your daughters optic nerve will return to a normal pink color or to normal functioning from what you have told me. I can't truthfully tell you if chemo, radiation, surgery or observation should be done at this point. That question is best put to the doctors who are helping you and your daughter work thought this very difficult issue.
I will be happy to help you better understand what is going on as you move forward in this process. If you want to bounce issues, test results, recommendations off of me....or if you just want to vent, please, drop me a note and I'll be more than happy to help.
Please, let me know how things turn out. Take care.