She definitely has a plan, if she isn't going back to dump a pregnancy test on him good chance she's going for a police report in some way in person.
This. 100% this. I've also had this theory since the first visit (let's not forget the pre-natal vitamins), but I'm quite surprised she didn't go full force on this yet. I HIGHLY doubt that she told Cobra she's pregnant in private, and she hasn't made it public amidst all the domestic violence allegations. But in this trip, she's definitely going to try this angle. Nothing else worked. So she's going all in, no doubt in my mind.
But I think some people are reading a bit too far into this. Yes, she is a textbook attention whore. But I mean, many people seem to think she's doing this for clout/attention, and I don't agree with that.
I think the answer is much simpler: she wants a house and she wants money to feed her addictions. And Cobra can give her that. And she knows that he's easily manipulated by alcohol and her baconator, so she's going the easy route. No man would ever put up with her shit, but he does. She sees a means to an end, that's it.
I also think that, going a bit deeper, she feels like she is a failure (and she's right, she is fucking worthless) because she never settled down. I bet she saw all her real-life friends and family members get boyfriends, get married, get a house and have children, and she wants that "white picket fence" dream for herself. And her reality is that she's a saggy, ugly, busted, 40-year old woman pissing in a box in her parents' attic. It doesn't matter HOW she gets it, she just wants to tell everyone that she finally settled down. Just like Cobes doesn't give a fuck who he's dating, just as long as he can say to the troles "I have a girlfriend", she wants to tell her haters "I got a man now". Love isn't even a consideration to her.
All this bitch wants is to get out of her parents house, so she stops seeing herself as a failure, and then she'll be able to insult everyone and say "oh you're just a demogorgon basement dweller living off your parents". She wants a house and money. That's it. I also think she desperately wants a baby to make her feel like she fulfilled her "job as a woman", or because her bio-clock is running out (thank sky god) but she will never love or take care of little Jason Vorhees Boyle. She wants to have a baby, but she sure as shit doesn't want to be a mother.