Yes-her hair will grow back. My dog was treated with ivermectin. She had several bald spots on her face and legs and she's black so they were very obvious. There may be a genetic component to it but it's mostly from just being a puppy with a developing immune system. Mine started getting bald spots right after she finished her third round of vaccines. My vet advised me not to spay her until it was completely cleared up.
You may want to pick up some goodwinol ointment to put on the spots-that's supposed to help.