Today I talked to a counsler about my friend. Was I doing the right thing?

Okay, so over the past few months, my friend has started dating this guy, and ever since then she firmly believes that she is a vampire. Yes, a VAMPIRE. She ALSO believes that she is a demon and that she will one day rule the underworld with her current boyfriend who she claims is ALSO a vampire/demon. She has started hearing things and seeing things that aren't really there, and she always talks about death and drinking others blood. She claims that she can 'transform' into a vampire, and that when she does she loses complete control of herself. This, of course, brought some concern to my other friend and I, so today we finally decided to go speak with the school counselor, because we fear she is a threat to not only herself but others. We are very concerned. They are going to contact her mother tomorrow morning, and then she will find out that I went to someone for help, and she will absolutely HATE me for it. She may not understand this now, but I really do care about her, and I don't want her to end up hurting someone or herself. I mean, for gods sake! She talks about KILLING PEOPLE and DRINKING THEIR BLOOD. Its not right. So my question is....do you think I did the right thing? Im so upset because my best friend is now going to hate me...but I guess its better to lose her as a friend than for me to not say anything and then something bad happen...right? Please. I just need opinions. Thank you so much.