Well Dan took zoey to see her boyfriend at the pet store to cheer her up, and got her to eat dinner normally last night again breakfast this morning. So it looks like she was just not eating because she was depressed after all.
But now I have a way more major issue that Dan told me about this morning. Apparently, she has had some accidents in the past couple days, and Dan has had to re-instate the crate as a result. She even had one in the bedroom, which until now she has always considered sacred territory (even as an un-potty trained accidents). It appears she's so pissed off at me for abandoning her that she no longer cares about the rules about where to potty. Now I am afraid that, unlike the eating, this won't go away automatically when I get home. What the heck am I supposed to do now? Re potty train her? I am so screwed.
I'm going to be afraid to take vacations and trips after this. I might expect her to act up if we left her at a kennell or something, but for christ sake her puppy-daddy is there with her at the house.