She lets me know she doesn’t like what I have for her to eat. She will say I don’t want that. I asked if she wanted yogurt. She said I want yogurt a few weeks ago she barely talked. Was mostly nonsense and I had to do different things to get her to swallow her purée food. Now eating some soft things again.
I just wouldn't force her to eat or drink anything as she may at this point be having trouble swallowing. Plus if she's in the dying process eating or drinking can be very painful for her. That's where hospice comes in as they can better walk you through the process.
But to answer your question, yes stopping talking, eating and drinking are all part of the dying process.
Please call hospice today if you already haven't. And yes they are available 7 days a week 24 hours a day.
Here is a link to a good article with end of life information:
https://www.alzheimers.org.uk/get-support/help-dementia-care/recognising-when-someone-reaching-end-their-life
Wishing you the best of luck with a difficult situation.