Sad thing is, Estradiol is pro-inflammatory too.
The 6 new findings suggest pro-inflammatory action with all being positively associated with circulating estradiol: serum amyloid P (SAP), soluble IL-1 receptor 2 (sIL-1RII), resistin, chemokine (C–C motif) ligand-21 (CCL21), basic fibroblast growth factor (FGF2), and IL-6
That's one of the reasons why taking progestins help some women with thinning, cause they mediate inflammatory effects of estrogen domination.
Overall, im pretty sure that inflammation is the main cause of any hairloss, because its a predecessor of every disorder from hair cycle disruption to any autoimmune disorder (fungal, viruses, allergies, you name it).
The difference between male and female hairloss is basically that women need PCOS to make a lot of andogens, and men make them by default. The other minor difference is skull anatomy, because of it women are more prone to diffuse thinning.
Other causes are the same for both: CAH and ncCAH, Prolactin, Estrogens (as mentioned above), stress, digestive issues/bad diet, and, in some cases, gene mutations.