When she doesn't care about DH or mine?
Yesterday we had DS's christening and MIL had offered we could hold the 'party' after at her house as it's local and also big/small enough for our guests. We agreed and she offered to do bits of food but we said thank you very much, we don't want you having the added stress but could you do the cheeseboard please as they enjoy doing that and it's just shopping.
After the service I did the last few jobs (mixing salads with dressings etc) whilst they were offering drinks etc, and left it all on the table.
Went into the living room to be look after DS, 10 mins later DH came in and said plates and cutlery were ready, we could all eat. When I got there, all sorts of other food had been added. So although what we'd done was a meal and all went together nicely, there were now salads, snacks, sweets etc which were all a bit odd and out of place. What made me feel better was no-one really took what she'd done (she hadn't made enough for everyone anyway) but MIL and thus dutiful FIL didn't take any of the food we had made.
AIBU to be annoyed that MIL would ignore the fact I was doing the food and 'add' her own bits? AIBU to be annoyed she would ignore the food provided and rudely eat what she wanted? I am very grateful that they had it at their house, very grateful that she wants to help, I understand it can't be all on my terms but I feel insulted that she would ignore my feelings (and for that matter DH's) to do what she wanted either because she couldn't handle it wasn't her who had done it all or, because she didn't want to go along with the plan (something she seems to have issues with).