I'm the OP and I'm pretty surprised at the responses!!!
I'll try to address a few.
~ I never said DD was being "threatened". I said "pestered", which means annoyed, and that's exactly what I meant. Not sure why anyone would think I meant anything else.
~ I'm a teacher, yes, but I teach 4-5 year olds. I don't deal with teens in a school setting, so I'm not sure why everyone thinks that I should know what to do.
~ I'm not treating my DD like she's 3 years old. Can't figure out where that thought came from. DD talks to me daily about Susie. When I come home at the end of the day, the first thing out of her mouth is, "Guess what Susie said/did today?" Clearly, she is bothered.
~ I think it is DEFINITELY "wildly inappropriate" (my words) for a 16-year old girl to suggest to a 14-year old girl that she should "hook up" and try to get pregnant! Does no one agree with me on that point?

~ I'm not wanting to talk to the counselor at school about MY DD --- I want to talk to her about Susie, and the fact that she might need some guidance on the appropriateness of talking freshmen girls into becoming unwed mothers.
I like Susie. I always have. Remember, I told DD to be friendly at first because I felt that Susie is probably scared and embarrassed and needed a friend. However, for Susie to suggest that my innocent daughter have unprotected sex at age 14 ---- that's going too far.
Susie doesn't need a friend. She's rather popular. Her parents are supportive. The baby's father is in the picture (he's 19), and his parents are supportive. I don't know what her angle is.
Sorry I posted. Didn't know pregnant teens were so popular, and being a geeky honor student meant that you are a coddled baby.