Damn, sorry, totally forgot this was still in my drafts.
Tropes do often have some basis in reality. The issue arises when they’re consistently presented with a certain message. In your cousin’s case, it worked out, but it doesn’t always.
Including a plot in a story is a deliberate decision and when it’s something we already see so much of in real life, like the importance of motherhood and how it changes you, then it reinforces that message. I got an ask a little while ago about cheating and how it’s glossed over in f/f ships and my thinking was that the danger is less extreme because there’s no debate about it in real life, we’re never told cheating is good or excusable and in fact, in these f/f stories, it’s portrayed as bad and causes guilt and shame. But we can’t say that about every trope.
Eva has been a bad person, no doubt, but that’s separate from her being a woman who doesn’t want a baby. And she’s emphatic and not at all ambivalent about it. She’s entitled to that, no matter how good or bad she is. Like, fine, yes, people do get pregnant accidentally, and it definitely makes for a good drama here, but she already has so much else to kickstart her “redemption”, I personally would not like for her to clean up her act because of a baby.