Sometimes 24-ish hours before my amel sheds her skin she gets "skin wrinkles" that look somewhat similar to that...but not quite as big. Kinda of like her skin is almost crinkle-y. I have no idea if thats what is going on with yours, but I thought I'd throw my 2 cents out there. I guess that could be a possibility. And if it is, then she'll probably be fine as soon as she sheds...my girl is really healthy despite the fact that she is the only one of my snakes that gets that way.
It seems she is eating though...the food lump looks about the right size, and if you see her drink a lot then that seems like a good sign too. How often do you feed her? I would guess that she either needs to be fed more often, or she is about to shed. That is really very interesting though...