Rebecca didn't know, but she's just really mean as a way to protect herself. It could be the in first several episodes versus the pilot specifically. It's been awhile since I watched all of them.
I agree that as you age and go through life decisions, some of the stuff Frannie says isn't really that awful. She has her points.
Rachel, Alexa brought up a good point. Please feel free to start a Limitless thread. I'm sure a ton of people will be excited to post about it.