My Daughter Is 11 Yrs Old. 3 Yrs Ago She

My daughter is 11 yrs old. 3 yrs ago she begin having some loss of left eye peripheral vision loss that was accompanied by others symptoms of ocular pain, weakness in her legs with unbalanced gait and frontal head pain. After hospitalization and many test there was no diagnosis. The peripheral vision disappeared and reappeared in her left eye for months at a time until finally there was no peripheral vision for the last 1 and half years. the pain in her left eye is so severe sometimes it makes her just cry and even taken to the ER this year. now recently she lost the central vision in the left eye. now she can on see blurred mixer of colors, Specialists after Specialist, Test after Test, 10's of thousands of dollars and still nothing that tells me why she lost her vision. She and I am desperate for help.