gerry I think maybe the most important question is is she getting help for this? Is she taking meds and getting therapy? It certainly sounds as if she is not, or is taking something that is not working for her.
I'm not an expert but I think that the things you describe can very well be brought under control with modern treatment... including meds and therapy. Many times people undergoing treatment feel much better, and then stop taking their meds because they feel "fine", not understanding that they feel fine
because of the meds. They may quickly sink back into old feelings and behaviors.
If she is unwilling to get treatment then I believe that your relationship with her will continue to be difficult at best. I don't know if anything she does puts you into actual danger, although the desire to drink your blood certainly doesn't sound like the "safe and sound" route. You will have to consider that. I hope you can get some more specific advise here or maybe from some books or speaking with a doctor to give you a better picture of the situation.
If she can get and accept treatment you may find she is a completly different person. In that case it might even be beneficial to her to have someone watching her... if her medication needs to be adjusted or if she stops taking you may be able to recognize the signs and be able to get her some help long before she realizes there is a problem.
Good luck and welcome to the forums.
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