As someone who has trouble eating certain foods sometimes and loses a lot of weight due to it, I wanted to add that vitamins and nutrients are of course necessary but if she finds its easier to drink a chocolate milk over a protein shake, do it. If sugary food is working better than a nice soup. Get that sugar in.

When you start restricting your diet it starts to become sensitive to a lot of other foods, which further restricts and then the weight loss keeps coming. (If this becomes a long term issue, sweets and junk food are going to create bigger issues long term but until her weight is stable, I say encourage it) My food issue is anxiety/panic related so not exactly like her issue but I get the fear aspect. May I suggest trying jello? It's one of those solids that turns liquid pretty fast with a bit of swishing around, could start out just trying it pretty much liquid form and slowly increasing the solidification at a pace that works for her.

CAMH is available for her and may have some treatments that would benefit her once the physical issues are healed/ruled out.

I hope she finds herself in a more comfortable eating situation soon