What should I do? Should I call the ambulance to take her to the hospital?

My dementia Mother been sleep since 8pm last night Friday and all day today; she kinda woke up but still 1/2 sleep around 2:30pm today, pee, I changed and clean her; feed her some Ensure, she went back to sleep; it's almost 8pm now, her brain want to wake up, but her body is not ready , like she cant seat up , her eyes closing, she said she's hungry, giving her some water; she doesn't want to eat anything, have no strength at all - well because she didn't have any food in almost 24 hrs. I don't know how to handle this? If we call the ambulance to take her to the hospital, not sure if they would do anything for her? Because last week she went to the ER, they checked her out and said all labs are normal, they let her go home after waited 8 hours there! So I don't want them to do nothing to help her and then send her home again, but at the same time, I don't know what to do at home. Is this the end of life signs?