My Mum (90) with dementia had UTI, flu and coma and now keeps saying she hopes her parents got home since she saw them last! Is this normal?

We are feeling pretty stressed.. the past month we've seen my 90 year old mum's health decline very quickly. She's had dementia for a few years but it was never that bad until now. The past two weeks, we've been called 3 times to say our goodbye's to her, as staff thought it was the end.She had the flu and chest infection, has a UTI most of the time and has had "turns"..not TIA's or stroke according to doctors..(who are baffled! However her brain scans came back negative)..where she goes unconscious for a short period..and it is as if she has died..but she rallies..however, this time, the third was a lot longer and she "came to" after a much longer time ( over an hour?) in the latest one, in which she was taken by ambulance to a hospital emergency ward. To cut it short she now, (two and a half weeks later), has been returned to her nursing home.She seems so tired and shuts her eyes,and is so confused! She now needs help to eat and drink..and is saying each day, over and over that she "wonders if her mum and dad got home alright". (of course both died years ago!! Her dad died at 52,when she was 22 and her mum died at 82,when she was 60. Strangely, she never mentions my dad.. which is weird).. I asked if she saw her mum and dad recently and she said no, and when I asked where did they go? I got "I don't know, but they were coming back I think". Most questions are answered lately with "I don't know"..like,"did you have a good sleep?" or "Did you have a nice lunch" etc..all are answered with "I don't know" or "I don't remember". Today she told me she is getting very confused these days.so it amazes me she is aware she is confused!.Some days she knows us and other days I'm not so sure, but we get a smile and each day we get asked about her parents getting home.. I asked her today "what would you say to them if they were here?" and I didn't expect her to say this..but she said "I would tell them we did very well without them." She seems to be unable to make much conversation, forgets visitors were there the day before. and sometimes starts a sentence, only to stop in the middle of it and then forgets what she was going to say.. It is so sad..has anyone had this too? Is it a normal progression?