My dad died almost a year and a half ago. He and my mother were married for 45 years. I stayed with her the first two months (Luckily, I was on medical leave for a hysterectomy, and we were able to be there for each other).

I had a great childhood with a loving, caring, nurturing mother who would do anything for anyone.

A few months ago, Mom began ranting and raving. Yes, anger is part of grief. I understand that and just let her get it out....she needed to do that. Her anger turned to rage, and she pushed away every friend she had. Some of them were 20 to 50+ year relationships!
She started using and manipulating others to get what she wanted, then dropped them like a bad habit. People helped her sell Dad's stuff, running her errands, doing chores, etc..... So many friends and family helped her move to be close to her only two grandkids and my sister. (only about an hour away)
She started having random fits of mania, but I did not know what to call them. I just assumed she was still healing from the grief.
Fast-forward to today. She has been in full-blown mania for a few weeks now. Changing her number, leaving the state and not letting us know where she was, sending these rambling lengthy texts with grand ideas, telling us God told her to do this and that (she was never religious).
Everything that she spews is pure hate, and you can't reason or talk to her. So I just listen and tell her how much we love her and want her to be happy.
A few days ago, she decided she hated my sister's husband and blacklisted my sister and her little boys! "I can live without them", she said. Before recently, they were her *world*.
I guess I don't know how to proceed from here. A few days ago, she decided to build a house out of the state and start these businesses. She's 66 and in great shape, beautiful, and so full of energy. She went and talked to a builder and realtor. Last week she was going to build a house on my husband's family land.
I looked up "manic episodes" after a few people mentioned it, and it describes her to a "T".
The thing is, she has never been this way. Ever. So it's all new to me. She will refuse meds because her sister had depression and sat in a dark room and chainsmoked all day. She thinks anyone on meds will end up the same way! I take anti-depressants and have a job at a Health Clinic, so I don't see how she still thinks it's true.
My sister is heartbroken. All Mom's friends love and care for her. None are angry, just very concerned with the erratic behavior.
Sorry for the long post. I have asked coworkers about suggestions, but no one has actually dealt with someone having a full-time manic episode. There's never a "down". It's a constant up. She doesn't sleep much and buzzes around all day long, talking to herself or any stranger who will listen.
Does anyone have any kind of suggestions on how I can help her? She invited me to a lake cabin she rented 4 hours away, but I don't want her to tell me to ****-off if I try to talk to her. I am at a total loss here. Thank you for letting me get it out - I'm still trying to wrap my head around everything!