What should u say to a mean txt from a frnd?

[Bo]

Hi guys. I never posted or anything before so a little nervous. I got a anymore because she doesn't like me that I will loose all my close friends,problem with someone who I thougHt was a good friend. She basic said that I always put her down and never make an effort ad make her feel dumb all the time and that she doesn't think being friends means anything to me. I'm pretty shocked and I have no idea what to say. I don't think I've done the things she said but we are in a very close group so I can't really talk to any of the girls about it. Any thoughts on what I should write back or do? I'm worried if we're not friends because she doesn't like me the I will loose all my close friends in the group.