That’s very reassuring. Typically, though, we won’t repeat antibiotics in cases where the infection is unresponsive. And, clinda places patients at risk of C Diff. I am assuming the culture will return and give you an idea of which antibiotics will work.
I would be very vigilant about systemic symptoms (which it appears you are) like fever, GI distress, and breathing issues. I don’t normally comment on reddit on medical issues but I get on my high horse about pediatric sepsis. I am concerned because of the location of the abscess and that repeated courses of antibiotics have been ineffective. I think you are doing a great job of advocating for your child.