Hello,
Without examination,confirmation of a diagnosis is tough but it can be pityriasis versicolor or pityriasis alba. Pityriasis versicolor is caused by an overgrowth of a yeast fungus and are found mainly on sun
that usually resolves by adulthood.Severe cases may benefit by Psoralen plus ultraviolet light A photochemotherapy (PUVA).
I would suggest that you get it evaluated from a dermatologist.Pityriasis alba is self limiting but pityraisis versicolor may require antifungal treatment.
I hope that helps. Take care and pls do keep me posted on how your daughter is doing or if you have any additional queries. Kind regards.