Request assistance n guidance

My mom is a dementia patient and she is 79 years old. Your checklist on stages of dementia has been extremely helpful to me. 2 months back I got her back home from Australia ( she was staying with my brother for 1 year) and in 2 months there has been a rapid decline in her health. I believe she has declined fro. Stage 5 to stage 7.

Reason why I say is

1. Incontinence....she is on diapers n soils her clothes n bedding v frequently.

2. Since last 2 weeks....her sodium levels have fluctuating...as she gets diarrhea every 2nd or 3rd day....n her body is unable to retain the fluids in her body. Each time her sodium levels drop...its worse off and a new problem comes in.

3. She has lost her ability to stand up from. Her bed, walk to the bathroom or do any simple activity on her own.

4. She needs help for basic activities including eating nowadays

5. She has lost a lot of weight n muscle loss is v significant.

6. She speaks only few words...n at times ...we can't follow what she wanted to say. If we ask her any question, she does not answer....not even a yes or no.

I have kept a caregiver for the day to take care of her N i have shifted to her home since last 8 years...but evenings get bad. I am an office going person n our house is small, so keeping a caregiver at night as not feasible at this stage. I get exhausted taking care of her, My work, my family n daily chores. In India, hospice or dementia care centre's may not be very good n I am extremely apprehensive what to do.

Can you please tell me the following...

1. How long can the last stage I.e. stage 7 be?

2. How can I keep her comfortable...without taking her to washroom...I.e. changing her on bed is v difficult as she is non cooperative. She is not cooperative to go to washroom either n I fear she will fall

3. Any other techniques to keep her in good mood as she is always sad n depressed n sleeping most of the time.

Thanks