Does she have thick eyebrows? A newly developing monobrow?
I had these issues when I was about the same age as your daughter, and when I expressed discomfort about them my parents did the whole you are beautiful natural, and just the way God made you thing.
So I took matter in my own hand and pulled out the offending hairs with my fingernails. Problem is, many of them broke and even today I have to deal with ingrown hairs between my brows, all because my parents thought I was too young to dehair.
Maybe your daughter would benefit from some guided eyebrow grooming once they grow back
