You should have this check by the doc but yeast is not uncommon. Be sure she wears only 100% cotton underwear, wipes from front to back, do not let her take tub baths with any tub of bath product such as bubble bath or bath oil, do not let her sit around in a wet damp swim suit, do not douche, be sure her pants do not fit tightly in the crotch area and be sure she eats plenty of yogurt with live active cultures or takes acidophillis capsules. You should see the doc though and let him help you decide which medication he feel will work best for your daughter. One other suggestion is that she should not wear underwear to bed so that the perineal area has a chance to breathe. If she likes nightgowns this is ideal as she can slip her underwear off once she climbs into bed.