Tolkien doesn't seem to have that many women in the main
tales anyway, so
evil women are even more rare 😅 I mean, think about this:
Elrond's wife sailed.
Theoden's and
Denethor's wives died. We (seemingly) know NOTHING about
Thranduil's wife (which makes me mad , by the way),
Frodo's mother died, etc. Yes, we have Gilraen,
Luthien,
Galadriel,
Arwen,
Eowyn (there are
some female characters), but the stories seem to have limited roles for women. I haven't met Tolkien, I don't know why, maybe he just forgot and didn't realize that so many of his male characters had (apparently) absent wives, either through death or
the simple calamity of not one single sentence to guarantee their existence. 🤣
All of that is to say that maybe he just didn't really write too much about women anyway, so he didn't get too detailed about
Shelob, for example.