@PUNKEY,
The reason she is not allowed to speak with this girl is it is because her parents became involved. This daughter's dad actually texted my older teenage daughter threatening her -- I simply want her to have no more contact with her. This girl pretty much came out and said I don't want to be friends with you any more to my daughter.
Maybe the forbidden thing was explained a bit strongly - as I explained to her - there is nothing you can do about it if she doesn't want to be friends with you. So leave her alone. Her parents became involved as my daughter kept texting her saying I want to be friends with you I am crying, etc. My older daughter trying to help her sent this girl a text asking her to be nice to her sister and thus the dad sending a threatening message to my teenager -- I told them to just leave them alone as she has so many other friends there is really no need to bother someone that does not want to be your friend.
The funny thing is this younger girl is more verbal -- you know where she stands on everything she wears her heart on her sleeve. I don't mind the privacy -- it is when there is a real danger that I am concerned about -- for instance if she is really injured and she is trying to hide it as she wouldn't want to stop playing a sport for the injury to recover. Or someone threatening her or serious bullying.