I have had multiple surgeries and my hair has thinned considerably. I am 24 years old and am taking birth control pills. My doctor told me to take Rogaine, but I continue to have a very see through hair.
Female genetic loss can be accelerated and presented as thinning hair with any stress and surgery is such a stress. We have cosmetically treated such women with Scalp Micropigmentation, two of the women in my family have had it done. See here: https://scalpmicropigmentation.com/smp-for-women/
Also, I have attached a photo of a woman with black hair who has scalp micropigmentation done to address her thinning hair