
I'm really happy to hear you got bigger tanks, good for you!
What's your water change routine?
After a week enough ammonia can build up to effect you fish.
If you could answer Alessa's questions, it'd be very helpful so that we could help you.
Also, what temperature is the tank?
What are you feeding her? You can try soaking the pellets in abit of garlic juice, that should help stimulate her appetite and help her immune system.
Is the filter completely broken? What kind is it? A filter will not get rid of ammonia, water changes and beneficial bacteria will.