she has put a HUGE amount of weight on in the past month, don't want her to gain too fast as that causes big health problems. Kudos to you for taking on such a project, they're so so hard to put the weight back on. Easier than getting weight off an obese one, but hard work all the same, with how often you have to feed them to make sure they don't get sick!
As for her colour, I call it bay tobiano, with likely frame and possible sabino. That patch on her offside shoulder looks distinctly framey, tobiano does not put white on the face, and that big ermine mark on her nearside fore says white suppression gene to me. Frame likes to suppress leg white. Sabino because of her face marking being almost symmetrical, though even that is a little bit framey with how it's asymmetrical above her eyes and spreads out above them too.
The roaning at the edge of her "frame spot" is probably due to the tobiano. Tobi does that sometimes.