I don't know if this will work on her or not. Me and my friends somehow wound up around a one upper. When we realized that, we just started one upping her. If someone was telling a story she'd, butt in and of course have done more, blah blah blah, one of us would just do the same thing and one up on what she just said. Eventually I think she just got sick of it, and left us all alone after that. I know how you feel though. They are like one of the most annoying people in the world. Good luck with whatever plan of action you take.