Are her complaints real?

I feel guilty but sometimes I doubt she (83F, mild dementia) is really feeling the way she says. Yesterday, her back really hurt. But she was up doing dishes 10 minutes later. Today she had asked friends over for lunch. But she woke up and felt "horrible" and called and cancelled with everyone. I don't see any signs of her feeling unwell. I can't think of the last time she didn't have at least some small health complaint.

I don't think it is a ploy for attention but it could be an excuse to hang in bed. But she doesn't sleep. She'll be lightly snoring for several minutes and then ask me some question such as if I want lunch.

She very rarely goes outside except for doctors appointments.

Anyone else?