I've seen this in the salon many times. Girl A, is trying to convince girl B to change her hair and has been so persistant that she's gotten her into a stylist's chair.
One of my customers, with beautiful ridiculously long hair was cajoled into cutting it, by her "friend" with fried chin length "emo" hair (this is that joan jett hair that all the kids have).
The girl asked my opinion, I said your hair looks nice and you should only cut it if you want to... (The friend was quite annoyed.) We agree to just trim, shape and layer it.
When I was back at the shampoo bowl, I told her that her friend is most likely jealous, and as soon as she cuts her hair short, her friend will start growing it.
So we come back to the chair. The friend is talking to me about her hair at some point. I tell her, "maybe you should cut it shorter." The friend says, "No, I'm growing it."
My client and I laughed out loud.