Knots in my stomach

I can't sleep. My oldest had a sleep over last night. Her first here. She is almost 12 and her new friend, 13. They met through their grandmothers. They have only hung out a few times. I'm the one who suggested the sleep over. I wanted to meet this girl. I want my daughter to have friends here. I am sick with dread. This girl just didn't seem like the type of friend my daughter would pick. Is she desperate for friends or does she really like her? Please tell me I am over reacting? Obviously I need to expand her bubble. If this is a glimpse into parenting a teenager..I'm in for it. I'll be sipping wine all day, popin zanax like it's candy. I can't take it. My stomach is in knots. I would do anything to protect my children. I will do anything to keep them safe. This girl is bad news. I can smell it a mile away. I'm afraid if I tell #1 no...she'll just want her more. I will do everything in my power to give #1 other choices. Covertly, like a mom ninja. I will strongly steer her in another direction.  I'm starting to doubt homeschooling for numerous reasons, but this may be the front runner. It's time to drastically expand our circle of friends.