Yes, it was that way with my mother in law also.  One day we found her lying
down in the basement on the sofa down there.   I asked her why she was
there, and she said she didn't know where she was supposed to sleep,
although she had a nice room on the main floor of the house right across the
hall from the bathroom and had slept there for a couple of years already.
I just quietly brought her back to her own room.   She had forgotten
completely.

Many times she'd get up to use the bathroom and go instead to our room and
try to get in our bed when she returned, and our bedroom was further away
than her own, and we were in it!!!   We had to walk her back to her own
room.

She couldn't walk unattended anymore and she couldn't remember that and
would try and would fall.   They provided her with a "merrie walker," which
is a walker you can sit or stand in.   Later she went to the wheel chair.

Bushelfoot, you might try looking into the "Merrie Walker" instead of a
wheel chair.   It would preserve her mobility if she could manage to use it.
Look it up and see how it works.  They can sit or walk around with it as
they like.