Thank you for sending all these pictures over.
From what I can see is that she has diffuse hair loss and the hair appear very thin and fluffy.
There are a few things in the history that I have to correlate with this presentation with, like mental health issues and maternal hair loss issues as well.
There are certain congenital problems which can present this way such as congenital atrichia and hypotrichosis disorders,loose anagen and short anagen syndrome and hair shaft abnormalities. In order to diagnose that along with history the dermatologists needs to do thorough examination as well such as looking at facial features, dentition, developmental milestones, certain tests such as hair pull and tug tests and looking at the hair shafts under microscope called trichoscopy.
Then there are some acquired causes, which usually come later in life.
Diffuse hair loss due to acquired causes can happen due to telogen effluvium, alopecia areata, androgenetic alopecia, female pattern hair loss, loose anagen syndrome and hair shaft disorders. The answers to these could be found through examination as well.
As far as I can see the scalp, I can’t see any scarring, which is a good thing. Sometimes with mental health issues, diffuse hair loss like telogen effluvium happens but as things improve, it comes back to normal as well.
Carry on with regular healthy diet and normal routine till you see your dermatologist. Do not excessively wash hair to prevent further hair loss, 2 times a week is OK. Keep them loose, do not make tight pony tails/hairstyles. That’s the most you can do till you see the dermatologist.
I hope this gives you some idea about the kind of problems that can happen. And you can discuss these specifically with the dermatologist.