I've never gotten fleas or mites from my chickens or ducks, I did however get fleas from a fellow teacher about 4 years ago! She moved into a new apartment and the previous tenants evidently had a problem, and our teacher came to school with little bites on her, she was in the room next to me and guess what? Later that same day I had a few little bites, ok, no biggie, could be anything out here in the desert. She came in the next day and told us all what happened and we had to go to the DR for some cream and such and then we had to send home letters with all the students about it!!!
Tell her that her mommy brought home fleas from work, not her from your chickens.