There's one word that describes every symptom you've listed:
Depression. And depending on who you ask,
clinical depression.
The best I can do is this link.
http://en.wikipedia.org/wiki/Clinica...t_and_services
Remember that it's not your job to "fix" her, and it's not even your job to help her at all. You say you love her, so I'm sure you want to help her. But remember that it is not your responsibility to do so. Be there for her, but don't sacrifice yourself and your career.
I feel for you.