yep sounds like headlice, sorry.
If you can have a good look with a torch in natural sunlight, look for small whitish eggs near the scalp, usually behind the ears or nape of neck, they should be stuck pretty tight, if they come off (and look kinda brownish) they are hatched already.
you dont need much contact to catch it, at least you know her hair is clean! (lice only like very clean hair as they can stick to it better!)
also make sure that you check and treat every member in the house too.