It's me again. I forgot to mention that too much nutrical could make her poop poop get very sticky (hard to pass). You need to follow the instructions on the back of the tube. It's OK to go a little over but not too much. If you still worry about low blood sugar after you have maxed-out (is that a word??) on nutrical, try syrup (maple or whatever). It should help. Sometimes they do pick up something they shouldn't have and we just can't catch them every single time.
It's too hard to say what cause the problem -without seeing a vet. I hope she would get better soon.