This may sound a bit warped, but I also think it may have been because Jimmy couldn't give her a child (which I think was implied with their "trying" to no avail), and she wanted to keep him close to her, by making him think he spawned Jimmy Jr. The theme of not telling him about the rape for fear he'd leave her was pretty prevalent, so I kind of incorporate the fact that she might keep a kid to keep Jimmy around as well.
She certainly had issues with the kid, though - near the end of the show, I think even Jimmy realized that the kid wasn't her first priority, when he said something about how Jimmy Jr. always looked to her, but she couldn't return his love (or something along those lines).
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