You're all being too tough on the OP, IMO - especially the meat and dairy lovers amongst you!
We all do what we can - and some do more than most.
OK, I wouldn't do what the OP did, and when she thinks about it, she probably won't do it again.
But, as a vegan, she is not participating in the forced rape of cows; she is not complicit in removing calves from their mothers at birth (in case the calves drink the milk that is surely intended for humans!); she has no part in the so-called 'humane killing' of animals.
'Humane killing'! Tell me, what is humane about shooting a bolt into the brain of a mammal?
Do you eat eggs? Are you aware that every male chick is discarded? Mainly gassed.
There is some real hypocrisy on this thread, I'm afraid!
I became a vegetarian, then gradually (over 12 months or so) started eating a plant-exclusive diet, initially out of concern for my health. My sinuses dried up and my osteoarthritis was stopped in its tracks. I felt good about that.
Then I became aware of animal welfare issues and live by the maxim that no animal is being harmed so that I can live. And I felt even better about that.
Now I discover that the most effective thing an individual can do to help defeat global warming is to become a vegan. And that adds even more to my feeling of well-being.
So being vegan is at least a win, win situation!
We all do things without thinking, at times, but if you were to think deeply about the issues raised here, you would surely eat less meat and dairy - and perhaps give them up altogether.