this is most probably a bacterial infection and your doctor has rightly prescribed the antibiotic.
do not pick bacterial or viral infections in many cases.
the things you should do in this case:
1. maintain proper hygiene in and around genitourinary area and try to keep it dry
2. clean the area of any discharge regularly with some anti septic lotion like dettol
3. try to obtain a swab culture and sensitivity from the discharge that would guide you better in choosing an antibiotic.
you can give her some analgesics like brufen
if needed as they also help in decreasing the inflammation.
you should also complete the course of antibiotic prescribed.
wish your daughter a rapid recovery
thanks for the query
Dr. Amit Kumar