To be honest, I would be pissed too if I was her; but I hate surprise parties and April Fool's when they hurt people in the process (which they mostly do). But I wouldn't be butthurt about it decades later.
I am, however, still butthurt about that one time when my mother went out to party with her boyfriend of the month on Christmas of ... woha, 2008, telling me in advance that she might call me to come to the party later. She never called; what's worse, my PC was broken at that time, and I wasn't invited anywhere else. I ended up walking for half an hour through the streets, meeting a generous estimate of five people in the process, going into an Internet cafe to chat and giving out my phone number to the girl that would become my first girlfriend and my later ex.
Looking back on that small wall of text, saying that I am "butthurt" doesn't quite cover it.