Welcome. It's great to hear you are already seeing improvement! Make sure to test all family members for strep as well, even if they do not have any symptoms. Did the doctor say whether he will continue her on a prophylactic antibiotic once he believes the infection is under control? Also, with penicillin, I have heard a few times where it worked at first then after about 2 weeks, then they see backsliding. If this occurs, then I strongly suggest you ask for a switch in meds to either Augmentin or Zithromax. You can try the penicillin for now, but if it all comes exploding back,she probably needs a different antibiotic and don't wait to long for the switch. Hopefully, that will not happen.
Best of luck and hopes and prayers for a continued recovery.