We used to call when we were away. MIL never asked and we never told her we were away.
If we had told her we were going away even for the night she would have been calling every 10 -30 minutes with one question, phone down, ring again, asked when were we going again, where, what time, what had we said we were up to, were we coming to see her next week, who was going to buy her food, was she ever going to have food, was she going to starve, was she going to die. After that she would the. want to ring the police as we were dead. She would ring us about 10 minutes later and seem surprised we had answered as someone had told her we were dead. If we didn't answer a phone when she thought we should she would go into melt down. We had 10 years of this.