If I had to guess, she brought that Colin from home- for herself, so it’s a pic of her own birthday cake. She makes a huge deal every birthday about how Ma Ev ALWAYS buys her a Colin, and here, that it was her “mother in law’s” (FFS they’d been together a
maximum 2-3 months by this point) birthday TWINNED WITH HERS
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That would have been Jack trying to make the weekend (and birthday celebration) all about her, with the “look at the quirky BIRTHDAY cake
I bought for myself in M&S MY family bought me for MY BIRTHDAY and insisted I just had to bring along on this BIRTHDAY weekend!”
I also don’t believe she cooked a thing. I reckon she waited til they were just about to leave, scribbled that stuff on the board, quickly took a pic then rubbed it out immediately while everyone else was doing the hard work of packing, carrying and loading everything up into their big cars for the trip home.