There's a concept in economics called "lexicographic preferences". It's basically when someone has such a strong preference for something that they won't make any tradeoffs regarding that thing: i.e. they'll take whatever amount of that thing they can and then move on to their less preferred goods.

My sense is that many women have a lexicographic preference for pro-abortion policies and they'll vote for the pro-abortion option, regardless of what else it's bundled with.

I don't know how the left achieved this trick, but it's a very strong political force. Where I think they may have screwed up this election is allowing abortion protections onto state ballots. That allowed women to separate their abortion preference from Kamala. They could secure the abortion policy they wanted, without having to opt into all the other bad economic and social policies that normally come with it.