If Reneé knows Bella is a vamp what will she do?

She`d freak out. That`s the only thing i can think of right now. xD

She's tottaly freak and then start asking Bella all these crazy questions about vamps and stuff

She would probably freak and then start asking Bella questions, then she would go and tell Charlie and Charlie would try to kill Edward, or she wouldn't believe Bella and Bella wouldn't want her know so she would never talk to Renee again.

*Renee's head explodes*
shes been under too much pressure....

I'd imagine Renee would freak out and run from Bella screaming and never see or speak to her again and try and convince herself that it was just a dream

She may go insane because she's a childish person. When she finds out the truth, she wouldn't know what to do.

She'd tell Phil and then Charlie.