I was diagnosed in February and as soon as my BG was brought down within a week my hair started coming out in the bath/shower and brushing. There was quite a lot coming out, the hairdresser was a bit concerned when i got my hair cut after 3 weeks after diagnosis. I could pull my ponytail and have quite a bit come out without feeling it. It lasted about 3 months and now it's stopped falling out and has started regrowing. It's just the body's way of showing its had a bit of a trauma and it's a delayed reaction. As long as BG is controlled I was told it would stop happening and it did. I'm sure the same will happen with your daughter. What I did was get my hair cut to make it look thicker (blunt fringe and no layering) to hide the thinning which worked really well. Good luck, I'm sure it will work out fine! K x