Going backwards a bit because I have just been lurking here and not posting, the weirdest thing to me from the beginning of this, as just a person with a close family and older grandparents around Nancy's age, is that she was brought back to the house, apparently, at almost 10pm (after arriving over four hours earlier at 5:30ish). I know people have different schedules, etc. but MOST people that age are in their home, if not in bed, by that time. It's just a biological thing for most older people. [Edit for details: They like to get into their Pjs, wash up, take out dentures ha, and sit in front of the Tv for a bit to wind down before going to bed].
We have my grandparents over for dinner often and it's usually a 5:30pm ish pickup, with a 7-8pm at the LATEST return home, we go in and make sure the temperature in the home is good if it's winter, that the lights are on, etc. No we don't have to do that/they would be fine on their own, but I think most people can attest to similar with older relatives, especially if they're not the best on their feet. Late at night they are usually tired.
So that stood out to me from the JUMP as a detail for a casual (four hour) family dinner down the road. The late return from dinner at the sister's... If she was dropped off at almost 10pm for most people that's not bed until 10:30. Which again is pretty late for an older person especially if she goes to church in the morning.