Erratic, sometimes violent behaviors. What should I do?

My wife (69 early onset dementia) is showing very odd behaviors which have increased in intensity recently. Here are some examples:
-- She hallucinates there are people outside who need to be let into our house. On three occasions she has tried to go outside to let these people in. If I try to convince her that it is too cold for anyone to be out, she becomes agitated and violent. She has hit me with her fist on two occasions. I am installing double deadbolts on three of the doors that lead outside so she cannot get out. I worry she will react violently when she finds she can't open doors due to the deadbolts.
-- With the threat that she might leave, I am afraid to fall asleep, so I am exhausted most of the time.
-- She constantly invents stories about her past with people and places and events that do not exist or never happened. This can happen at any time of the day. She claims her mother was murdered, she was raised by someone who was blind, someone is trying to kill her, she is blind and etc.
-- She tried to leave the car while it was moving because I would not turn around and give two people a ride that she made up a story about. When I pressed the auto locks on the car she got mad and hit me in the side.
-- She threatened my son and I with a knife (I thought I had removed all sharp objects). She said she would cut me. She put the knife down after I told her I would call the police and that they would take her away.
-- She will suddenly get up and start talking very fast, sometimes hyperventilating, saying that we must leave immediately. I say where are we going? And she says she already told me - not true. She says if we don't leave she'll drive the car herself or she will puke or get hives. She has also told my son that they have to leave because I am going to kill everyone.
-- She has refused to get out of the car after we return home, but eventually complies. I worry that she will refuse to come in when it is cold out. I cannot carry her. What would I do?
-- Within the last month, when she is in the car or watching TV I often see her moving her lips and whispering as though she is having a conversation with someone.
-- She seems obsessed with eating sweet foods (not good for a diabetic). For the first time I have had to hide anything sweet or she will eat all of it.
-- When she wants ice cream she will claim that she hasn't had anything to eat for 21 days or 3 months, etc. As with most things, you don't dare say "but you have already eaten twice today.” She will get angry and sometimes violent.
-- She has accused me of having women in the house.
-- She gets up in the middle of the night and tells me that the house is full of children.
She had a UTI the week of Jan. 17 (last week). The diagnosis had to be based on behavior and urine odor because she refused to give a urine sample. After a three day course if Cipro, her behaviors have not improved.
She has had a history of refusing to do things such as bathing, washing hands with soap, eating properly, change clothes, brush teeth, etc. She smells terrible but doesn’t care. Doctors and family members have told her that she risks infections, but it doesn't do any good.
I am afraid of her. I am afraid she will go outside when it is 20 degrees, harm me, harm our son, or our little Yorkie dog. What should I do? Do I try to take her to the ER? Do I call 911 and have them take her to the ER? What will happens then? I doubt I could get her to go to a doctor. Our son is staying with us to help with this situation, but I fear for his safety. Two people have to be with my wife at all times.
I hope you won’t think I am cruel, but I don’t want her in the house. Her behaviors are so erratic, aggressive, and sometimes violent that I do not feel safe in my own home.
Help, please. Exhausted.