I have plans with friend next week to go to local park or do rainy day activity depending in weather. she has changed those plans by offering to do something with someone the same day and therefore giving me a 'window' when she is available on that day. This particular window she is offering me falls right in the middle of DDs nap time, if we were heading out somewhere it wouldn't be a problem as DD could just catch her nap in the car/wherever, but plans involve local adventure park so lots of walking/running about, no opportunity to nap on the move.
I have told friend it's not really going to work and perhaps we could just catch up for a coffee briefly after dd has napped and do park another day. She said that's fine and hopes we'll stay for dinner. I have told her we have made plans with my DM for dinner that evening.
She then messages, seeming quite put out, to say she thought I'd be staying for dinner as we always do. We often do go for dinner, but when we are invited for dinner, in this instance we made an arrangement to go out for the day (no mention of dinner before now), which she has now changed. AIBU to feel irritated that she seems put out when she's changed the goal posts or is this just a simple misunderstanding?