I can imagine the scenario.
1) She walks from door, and there are two brothers on either side holding her up, and they carry her up any steps and prop her up as they talk to the householder.
2) She sits in a wheelchair in the mall and passes out literature but has no idea what she's doing.
3) She rides in a car in rural territory and gets out once all morning again with the assistance of two brothers.
4) The sisters do telephone witnessing in her home, and because she's in the room, she gets the count the time.
I remember going in service with my father and mother when she was deep into Alzheimers. She just rode along. Had no idea what was going on.
Even if she was in perfect health and had all of her senses, why can't they give the old people a break? What do they think they are accomlpishing?