"Oh. I'm nice?" Why is this news to Jeff? And why is there some dumb rebellious impulse in him that's like 'no, prove her wrong! don't help her up!'?

Anyway, he ignores that impulse, because he doesn't want to be a dick. Which... probably proves her observation right.

Jeff takes her hand and helps pull her up, keeping it offered in case she needs to lean on him or anything.

"So, like. If I didn't see you get out of the hearse, I'd think you'd been run over by it or something. You okay?"