“tfw your coworker undoes your last hour of work”
I know that she didn't mean to undo your work, and she's going to feel bad, but at the same time, I think you might want to tell her because you don't want her to risk making the same mistake again?
I’m thinking about it... I’m just hesitant because it’s not likely to happen again regardless and it wasn’t really her “fault.” (She did something perfectly normal that wouldn’t have made any problem except for supremely terrible and unusual timing that was on the level of a British situational comedy skit.)
She is also very shy & English isn’t her native language, so sometimes her confidence gets rattled. If I tell her about it I want to do it so that she doesn’t take it too hard or think that I’m upset with her. :T