This woman just wrote back to say that she wanted the caregiver to come to her block and move the cats downstairs. I told her that the caregiver had come over to help earlier this week, not knowing that she was the one who used to feed the cat, and wasn't going to do it again. She wants the cats moved downstairs so they don't come up again. She said she had done it once but they had moved back up.
She wrote back to say she can see she's not getting any help on this matter anymore. I just replied to say that if she hadn't fed the cats in the first place, they wouldn't have come up, or at least reinforced the behaviour to make them continue coming up if someone else was also doing the feeding.