Your grandma is suffering from dementia.
One of my previous ex ex girlfren, her grandma also like tis
wan. Last time she used to be closed to her grandma but when she
came back from overseas studies, her grandma changed. Don't
recognise her anymore and not even speak to her. Then her grandma
started taking her things and kept them under her bed. When ask,
she said it is her things and ask some other time, she completely
forgot. My ex ex galfren neva understood her grandma, all of the
sudden the grandma became very difficult, always walk out from the
home and then dunno how to come back, luckily the neigbour spotted
her loitering around and took her back home, to our shock, becuase
we thought something happen to her.
My ex ex galfren completely detach from her granny bcause she
neva understood what is wrong with her. So the family sent her to
old folks home. But last year, i heard from a fren, she past away.
My ex ex galfren cry a lot, regretting that she didn't spend a
lot of time wif her granny.
Long ago, one of my gal fren told me her ex boyfriend left her just
because she had a dementia grandma, and he was a Doctor. What a
waste, the reason for leaving was that this Dr bf worried that my
gal fren will become like her grandma when she grow old, I told her
to tell the Doctor go screw himself