What should I do with her?

My cousin is 14 and 3 weeks ago called to tell me she is pregnant...[she lies a lot so I dont believe her] I am also 14 and I told her people doubt our next generation because it is people like her having kids when they are just a kid themselves. She called me a 'sell-out' and told me to stop acting white because I am black. I told her she is insulting the black community by saying acting black is barely finishing middle school and already having kids. She got mad and called me every name but a child of God and she has been real disrespectful to me. She calls my phone and I reject her calls because I dont have time for her immaturaty then she leaves horrible messages threatening to beat me up and things like that...I'm not scared of her but should I still allow her to be apart of my life? Should I forgive her? She treats me really bad and all I do is help her. I am sick of helping her if I'm going to be disrespected.