Discussions

No idea what to do and not even sure if I totally understand the problem..  
Daughter was on MSN tonight and was suddenly signed off. When she tried to sign back on, was told the password was incorrect. She's on it everyday so its not like she forgot it. She texted a friend to see if she was showing up as logged on to MSN which the friend confirmed she was. She went to her friends house and who ever took over the profile started carrying on a conversation with the friend. When the friend asked who it really was, they replied Hacker. Also, our daughter discovered that her Facebook profile password had been changed as well and daughter can't access it anymore either.  
What can a person do in this case? I understand that she'll have to create new MSN, Facebook profiles but we're worried about putting any email addresses or Facebook friends at risk.