is it fresh or salt water? if it was a swim bladder problem then she would have troubles either sinking or floating. if whe was swiming around before and now just lays their then there may be something else wrong. when i encounter stuff like this i just do water changes often (like every other day) and hope for the best. save one fish this way.

I have been keeping saltwater aquaira for 12 years now (makes me feel old!) and have had fish die for no reason what so ever. it happens in the fish world. i recently lost a puffer fish that i had for 3 years. it sucked because puffers have a awsome personalitly and will come over and puppy dog for food.

keep your chin up. it happens. if i had all the money i spent on fish........