I'm with Athena on this one. If her cowoker said she could have some, didn't put a limit on how much she/they could eat, and didn't let her know she was saving some for a client, it's pretty dumb to get mad at Athena for eating it.
If her coworker was saving some, whether for herself or a client, she should've put a note by/on it that said, "Do not eat."