
Hi
I would take her back to the vet if no improvement is to be seen after 2 weeks on antibiotics. Sometimes those infections have to be opened and emptied to heal.
Being tired is one of the side effects of antibiotics, loose stools/upset stomach is another.
From how you describe her problem, I don't think she has a skin infektion, but the vet is who you should consult on this. Noone can say for sure without actually examining your dog.
Good luck,
Karen