It happens every time we go away, or go out, she goes out. It's like she is still 14!
If DW has not been "bigging up" the weekend/ evening for weeks beforehand, and did not give MIL exact notice of time of return and a full debrief as soon as we get in, then we find 6 messages on the answerphone (increasingly brief, with the effect that the fourth is "Aren't you in or what?", and the fifth and sixth consist of "Humph!" and the sound of a phone being slammed down).
If we should happen to have been socialising with friends she has not heard of, she gets the third degree about who they are, where they are from, how we know them... She is most miffed if we have arranged something without her knowledge and doubly miffed if it's with someone who doesn't immediately fit into a little box!
If she has called and we weren't in, the conversation always starts with "Where were you?" And "Oh, just out" is IN NO WAY an acceptable answer. It leads to excessive miffery and likely slamming-down of phone.
Do your mothers do this??
My mum, on the other hand, just says something like "Did you have a nice weekend/evening, then?" and although I know she is angling for full details I don't mind telling her as she doesn't make a big thing of it.