We threw a small party a few weeks ago for DS's birthday. My mother had offered to make a cake. This was very kind of her, however it's our child's birthday and we really wanted to provide the cake. Explained this to her and asked if she could make something else instead.
Skip to party day, she turns up with the 'something else' AND a cake! Ultimately the centre piece of a birthday party.
AIBU to still be quietly raging about this?
Yes - get over it, she was just trying to be nice and it's only a cake
No - she didn't listen to you, didn't care what you wanted and tried to take over a little bit