Because she is not attention starved and doesn't want to leave him at all. She deeply resents her husband despite loving him dearly.
Her recurring mistake is escaping from consequences of her actions to the bitter end
The abortions are also probably caused by her habit of escaping from her consequences over taking responsibility. She is basically doing the thing she wished she had done when she first got pregnant over and over again.
I can see your pov but if her primary focus is actually her husband, then why pressure the doctor to be a voyeur? (Chapter 13) Even when Moe had captured him, he didn't doubt it was the Mom doing weird stuff and none of that has anything to do with her husband. If we learned the doctor and husband had the same name or were connected in some way that would be one thing but I don't think there is.
I also don't agree with the motivations about the abortions because those hurt her husband the most and she kept it secret. I don't think she's clever enough to have purposely carried Moe to term just to say, "I aborted all
your babies and here is a random one!" It's too long of a con at this point.
I think she's very afraid of her husband leaving her. Which is why she throws money (and now a baby) at their relationship. Even separated for months, they're still married and if they have a baby, he won't leave her. That's why I wonder if she got pregnant on purpose as a teenager. Maybe he thought they'd break up when she went to college or she was afraid of even going to college and this was an easy way not to have to go. Even if her grades sucked, we know she'd get into her own family's university.
But even in chapter 13 where she starts her pregnancy plan, she refuses to reconcile with him (perhaps because her husband suggested it and she didn't yet) so I still think attention seeking is more likely