I'm not American, but i imagine there were numerous reasons. The word 'feminist' as you are using it seems to imply that women's issues and perspectives must all be viewed through progressive/left wing lens - but they are not. Some women might actually think women's needs, and certainly women with children, are best met within a strong family network.
I imagine many women feel the economy and their family finances are the most important issue; and many will have been concerned not just with that but with ideological capture in schools around gender identity, around boys in girls sports and so on. Riley Gaines came out for Trump on issues such as this - and was an excellent spokeswoman and campaigner for women and girls rights.
I imagine many felt alienated by the progressive west coast liberalism espoused by Kamala Harris - even if she, and they, also believe in a woman's right to choose. Antifa, rioting in Portland, Defund the Police...stuff like that. illegal migration, of course...as is the same across Europe
Behind Trump is the Republican Party......and even should Trump stand back they will still represent those women on those sorts of issues. I see that the Republicans won back the senate - which means people were also voting for Republican candidates, as well as for Trump.