Hi..I have been a Cosmetologist for 31 years. I have never tried or heard of anyone that has used LLLT for thinning hair. First, I would say you need to get to the root, no pun, of the problem first. You can go through all the LLLT you want, but if there is an under lying reason for it, the LLLT is a waste of time and money because it will happen again. There are many reasons for hair loss or thinning like, did she start on any kind of medicine's recently? Is she or has she been using like pot or any illegal drugs? Does she drink alot of cola drinks? Have you changed shampoo's? I say that because when I was in school, we stripped a table with Prell shampoo, so you can imagine what it does to a person's hair. Other reasons may be hard water, health issues or even hormone issues. Lots of possiblilites but I would get to the sorce of the problem before spending anymore money on LLLT.