Paula isn't just bigger, she's also mentally changed to fit the new body.

To Jed's surprise, Paula didn't seem too surprised or upset by her changes. Instead, she scratched her exposed belly, let out a rolling burp, and yawned. "Why'd you guys wake me up?" Paula looked like she was about to rise from the couch as she stretched, but then changed her mind and sat back down. "What's for lunch? Oh, and the dishes haven't been done, so you might want to start on those, babe."

Unsure how to bring this up, Jed gently ventured, "Uh, Paula, have you noticed any changes? Like, maybe since this morning? That happened to you?"

She looked at him like he was a complete idiot. "What, you mean the fact I weigh twice as much and smell like a trash can? Yeah, I noticed that Jed." Then, she shifted a little and let out a thunderous fart. "The thing is though, I'm not too broken up about it. I bet you'd love to get be back to a skinny twig, all prim and proper, but I love being a slob. I don't have to worry about anything, I just get to relax and stew in myself."