having a heck of a lot of trouble with a friend, don't know what to do, here's the situation:

she's been being extremely agitated but I don't know the cause and she wont open up. she's been slowly cutting ties with many of her friends, even who she was closest to, me included. she's also been replacing some people, even her best friend. iv'e heard rumors that her parents have been arguing more and more and have been threatening to get a divorce, and this seems to be putting her under a lot of stress as well as other factors. her emotional instability worries me, any advice?

well depending on how close of a friend you consider yourself to be to her either talk to her directly about your worries for her and ask her what you can do to help or just be there for her like a shadow.. when the time comes for her to realise she can count on you for support she will approach you herself