A pays a very rare (annual, if that) visit to a now elderly and frail relative. A has recently had some tense words with relative's spouse and carer (B) because despite the explicit request of B that A give at least a couple of days notice of an intended visit, this was ignored by A who announced her intent to visit only the evening before. One of the reasons that B requested notice is that B and relative live rurally, and due to relative's infirmity, it is hard for B to get to the shops to cater for unexpected visitors.
Visit is rescheduled with appropriate notice. A arrives with a range of food, the majority of which is not suitable for relative to eat.
AIBU to think the bringing of food was in this instance thoughtless rather than thoughtful? B had had enough notice to cater for guests. A did not make enquiries as to what was suitable to bring so brought food that was then wasted. AIBU to think this was more about A being able to say that she had tried to help but it was rejected, rather than being genuinely helpful?
(Yes, there is more background to this, but explaining it all would be an essay. It got the visit off to a bad start, but B now thinks she was BU to be annoyed rather than pleased.)