Mom is now repeating almost chanting" Maryjane", which is not my name or calls out constantly for "mom". Anyone else dealt with this?

Yes, she is remembering perhaps HER mother. Long-term memory allows the patient to relive childhood events, takes the patient back to happier times as a child, and will believe you to be a sister, a mother, or in my case, my mother thought my husband was hers. It is just the disease talking so calm down. There is nothing to do except be in the place the patient is in, listen, and take one day at a time. Best wishes.

My mom has been chanting since July 2013. She spends most of the day in a somewhat trance like state just chanting "and I said...and she said....and Charlie said NO... (Charlie is her brother)," and on and on like this all day with some crying along with the chanting When she isn't sitting there with her eyes slammed shut chanting she is whimpering and there is simply nothing you can do to comfort her or distract her (with the exception of turning the volume on the TV up as load as it will go, but as soon as I turn it down she starts right back up again). I try to give things to do like sort colored pompom balls, but I have to be there asking her for the colors or she won't do it like if I ask her to pick out a certain color and put them in a bowl and go try to do something else she won't do it alone. Anyway the chanting seldom stops for very long unless she's eating or sleeping and I'm about at the end of my rope. I know some people say I should be lucky she's talking at all but I doubt their loved one has done the chanting phase.

My mom has done this; and it was frightening to me at first; but now I just go along with it. I say "yes?, how can I help" -- sometimes she will have a conversation with the "imaginary person" or "have a conversation with me" and I just listen, hold her hand, gently nod and/or agree with what she says...then I re-direct or get her interested in something else and it passes and she returns to the present.

I used to be scared but I realized that it will pass and she moves on. I don't try to correct her or tell her about the "episode" later when she is coherent because I know it will be frightening for her or she'll deny it and say "you're trying to gaslight me!" (she's done that).

Hold your breath when it happens, let it out slowly and try to be patient. They can get in a loop and she may be focussed on MaryJane many times. You might try asking when she's coherent (another day) to tell you about MaryJane -- if she does, great -- you will have learned something. If she doesn't, let it go and don't tell her that she talks about MaryJane or has called you MaryJane - just say, "Oh Mom, I've heard you mention her and I just wondered who she was -- she seems to be dear to you..."