Hello,
@Dee M
What yourself and
@Duggies-girl describe is so common with people challenged with dementia. My mum would never have had a shower anyway, having been of the generation where one bath a week, then several washes at the sink was the order of the day.
At first, it was very difficult to get her to wash. And even now, insisting on a daily wash wouldn't be worth the hassle. More often than not, she'll also sleep in the same clothes she's been wearing in the day, so I've found it best to be flexible in that regard!
What normally happens now is as follows - nearly every day or night, she'll have a bit of a bladder leak. Being wet is uncomfortable, of course, so she always accepts me helping her to change her bottom half. Most of the time, I'll hand her a couple of wet wipes (thank God she can still do this herself), and she'll wipe front and back. I have to mime to her how to do this, a lot of the time.
About twice a week, I run a bowl of warm water with shower gel, with one flannel she'll wash front and back again. Then I always say "Let's kill two birds with one stone" and I'll wash under her busts with another flannel - again, she readily welcomes this as she's had trouble with sweat rashes there in the past (she holds them up). Sometimes she'll even accept me washing under her arms and back. So it's been gentle persuasion over a period of time that's got us to this.
Same with her hair - at first it was very tough, now she agrees to me washing it under the shower, while she leans over the bath - about every 7 to 10 days. I always say how good it looks, what great condition it's in, afterwards.
Dentures - again, at first, very difficult, now she'll take them out (I have to mime how she'd do it), then I'll wash them while she rinses her mouth. All this with gentle persuasion (except first time with the dentures).
Like you, I slept in the same room at night (on the floor) for 3 months, but then for my own mental health, went back to my own bedroom. That made a big difference to me, and was accepted by my mum.