With her conditions, she needs to see a vet. The vet that she was seeing before, do you still use him? A lot of time with regular clients my vet will work out arrangements with you. You need to call and see if that is a possibility. Honestly, IMHO that is your only option because she really needs to be seen.
If I understand correctly, the panting can have something to do with the heart if it is not heat related.