She fights me when changing her diaper. She fights me and tries to get out of bed, and she cannot walk. She tries to get out all the time!

This situation sounds like an accident waiting to happen. If she is struggling so much and trying to escape, she may end up falling.

Please allow a trained staff to care for her.

Best wishes to you and your loved one.

Your mother is exhibiting signs of anxiety and agitation which is common with Alzheimer's and dementia as it progresses. You don't enjoy her fighting you, and she's not enjoying the fight. Call her doctor right away to discuss calming medicine such as Ativan to relax her a bit. Get a hospice evaluation ( her doc can order one) and they can bring a bolster pillow type thing to put on top of a hospital bed to cup her body and prevent or cut down on the falls. Not all of them......my mother fell 95x due to thinking she could walk when she couldn't. You can't fix dementia. But You can medicate her to where she's functioning on a better level in general, meaning so are YOU.

Then look into placement bc it's time to consider that now.

I suggest you read this 33 page booklet online about managing dementia and what to expect with an elder who's been diagnosed with it. Lots of Do's and Don't tips for dealing with dementia sufferers are suggested in the booklet.

Understanding the Dementia Experience, by Jennifer Ghent-Fuller 

https://www.smashwords.com/books/view/210580

Jennifer is a nurse who worked for many years as an educator and counsellor for people with dementia and their families, as well as others in caring roles. She addresses the emotional and grief issues in the contexts in which they arise for families living with dementia. The reviews for her books are phenomenal b/c they are written in plain English & very easy to read/understand. Her writings have been VERY helpful for me.

The full copy of her book is available here:

https://www.amazon.com/Thoughtful-Dementia-Care-Understanding-Experience/dp/B09WN439CC/ref=sr_1_2?crid=2E7WWE9X5UFXR&keywords=jennifer+ghent+fuller+books&qid=1657468364&sprefix=jennifer+ghent%2Caps%2C631&sr=8-2

Teepa Snow also has videos on YouTube you can watch for tips on how to deal with demented elders, changing them, showering them, etc.

Best of luck to you. 

For her safety and for your sanity, please put her in a facility.

Consider in-facility placement now.