Kamala didn't respond because she didn't want to talk about that issue, which makes sense. I'm no political operative. I don't know whether "ignoring it was the worst strategy." I don't know that anyone knows that.
I just fail to see how Kamala disavowing that would have reached the low-info voters you say decided the election. And since the GOP campaign was truth-free, it's not as if anyone would accept the disavowal any way. And yeah, Kamala was struggling with the left because of Gaza, so she decided the best course of action was to refocus attention on where everyone agrees. It didn't work, because "threat to democracy" didn't resonate and the XX strategy playing on abortion rights turned out to be a dud.
If it were me, I would not have put so many eggs in the "women will vote for us because abortion" as that theory has never proven true. I said as much at the time. It's just not the most important issue for lots of women. But again, I'm no political operative, and it's easy as fuck to sit here on a message board and say, "they should do X, they should do Y"