My 4 year old daughter is on keflex for a bacterial vaginal infection. could the antibiotics give her a yeast infection? ive noticed some white around her inner labia?

Yes, that is possible. Please discuss next steps with her treating pediatrician.

Antibiotics will kill off any susceptible bacteria which can leave behind germs not affected by antibiotics. Keflex does not kill off yeast, or cause a yeast infection, but its use can allow yeast to gain access to areas they would not otherwise thrive. Yeast is a natural germ in the poop. If the kid is getting a vaginal yeast infection it is from stool contamination.