Wants to go home, to her parents home. How do we handle this better?

My Mother in law 86 is living with my Father in Law 92. They have lived in this condo for over 20 years. They have aides come in for 8 hours everyday. My Father in Law has back problems so has limited mobility but his mind is fine. They live in Florida all three sons live in the Northeast. They try to visit once a month. My Mother in law has these episodes where she says she has to go home because her parents will be worried. She wants to call them and she wants help getting home.

When asked for the address she wants to go to she give her present address but is confused if you show her that that is the address on the door. We have tried arguing with her sometimes she backs down, other times she digs in. My father in law puts us on the phone with her and she hangs up if we don't agree with her.

She is having a bad episode right now. We are in Boston and told her that we would pick her up in an hour and that she should take a nap, as she usually is better when she wakes up. But she stayed awake and remembered. So we called back and said we had car trouble. She decided to call a taxi. According to my Father in Law she left with the aide a few minutes ago, with a bag she had packed a few things into. He assumes they will try to find a taxi and see what happens.

Any ideas on how to handle this situation better, in the immediate situation and long term would be appreciated. I think the recommended approach is to try to enter her reality as much as possible, but we can't actually take her home. My Father in Law is opposed to putting her in a memory care home because he feels that taking her out of her home will make her even more confused.

TIA