Hello Gamesgroup and welcome! Hoping the best for your girl. How old is she?
I noticed in your picture her left eye is mostly closed. Is that regular or just happened to be that way in the picture? How is her balance?
We just went through an experience where symptoms originally presented as a neck issue as well. Please report if she begins curling her head upside down or loses all sense of balance. As Eggcessive said, we started on vitamin E and a third tablet of b complex per day. We used a pestle and mortar on crumble to grind to a fine powder then mixed with vitamin water, feeding with a syringe. Tubing seems the preferred method, but we couldn't get the supplies needed in our area.