It sounds as though you are on the right track. I am however, curious as to what level the spina bifida was located. I am guessing L5S1 as it is a common area but also because of the ankle issues. Neurologically, the L5S1 nerve roots control, to a great extent, the ankle and foot. As I stated above, it sounds that you have given her a good functional program including strengthening, PNF, E-Stim, and weight-bearing activities. In conjunction to this I would begin to look at her on a structural level especially through the LS junction (L5S1), assessing biomechanics, dural mobility, myofascial imbalances, etc. Addressing dysfunctions on this level will facilitate healing through the nervous system and allow for improved neurological control to the lower extremities.