Re: I have a problem.
^ And what is wrong wtih speaking english?
Honestly I think you need to stop being so strict. Give her room to breathe, to be herself. As long as she's not going outside the boundary of Islam (dating, dressing a certain way etc) trust her enough that she will do the right thing. If you're going to raise problems over what language she speaks with her friends, she's only going to want to rebel; it's goign to push her away from her religion and culture.