18 and thinks kids aren't a big deal?

My friend is 18 and having unprotected sex. I told her she is an idiot because she could get all sorts of STD's and she could get pregnant. Her response was she doesn't sleep with guys who have STDs and she is more than capable of taking care of a baby and raising one. Last week she had a pregnancy scare, and i'm trying to find some way to help her realize that kids are no joke, and they are hard work. She would also be a horrible parent.