In my research, some forms of alopecia are hereditary from the mother's side. I am the only one in my family who went to a dermatologist and got an official diagnosis. I have siblings and a first cousin that have hair loss (more than likely alopecia), but they have not gone to a dermatologist. They wear weave, wigs, scarfs, or hats all the time. I chose to shave and wear that in public. I walk tall and with confidence!
You may want to take her to a dermatologist and have it checked. In the interim, hold your head high. I would think the last thing you would want is her to be down because of they way she is perceived. Confidence comes from within. I am sure the road will be a long one. Stay strong.
Sorry your daughter is going through this at such a young age but hers may be just a couple spots here and there and then they grow back in. My dad last all of his hair twice growing up and once eyebrows included, my sister loses hers in spots once in a while but they grow back in, and I have been getting shots for mine and am on methotrexate which is helping the spots but my hair is thinning badly. So it can be passed on by family but not all family members usual have it the same way from what I have been reading up on, so best of luck to you and your daughter.