Hey Peaches. I was brought up very similar that it wasn't good to call boys. If they wanted to talk to you, they would call you. For most of my life, I stuck by that until I met my husband.
My daughter will be 16 next week and I struggled with the same thing. I didn't think it was right that she called boys, but then I came to realize that it's ok for her to do it, as long as she wasn't call stalking them. She has a lot of male friends that she just talks to. So, I think it's ok, but if this girl is calling that much, I would be scared! That's what I consider call stalking. It makes her look desperate!