The question seems to be why is she not eating? to help you better, please write how old is the dragon, what is the dragons weight, what is the size off the enclosure, what is the basking temp, does she have UVB light?
I suggest you search the web and find a bunch of caresheets, and compare them. Feeding a dragon 3-5 crickets is not much. They say you should feed a dragon as much as they will eat in I believe a couple of minutes. The crickets running around could be stressing her if left in all day, and could attack her during the night.
The fact that she has a fat bellie makes me think their is a possibility that she could have worms. I would suggest taking her fecal matter to the vet and getting it tested.
When you took the other dragon out, did you put it where they can see each other? I have heard if a dragon sees other animals like snakes it can really freak them out, even other dragons.
To sum up I would be most concerned with her temp, possibility of worms, and the amount of food given. I hope this helps, and wish you the best with your dragons.