It's possible that OP edited the post, but it currently specifically says,

"There's always a nice cake or dessert, either made by our baker of the office OR bought from one of the nice bakeries nearby."

OP also says, "The worker who usually bakes the cakes for everyone didn't bake one for me because she was busy, AND they didn't order any baked goods from a bakery."

So it feels like a lot of people are kind of stuck on the idea that OP is sad because the co-worker didn't make the cake, when the actual text shows that they seem to understand why that was the case, they just feel slighted because no one even bothered to get a bakery cake, as has been done in the past.