Cat not eating/only eating small amounts

My cat is three years old and a long haired calico. She’s very energetic, loud, and extremely food motivated. Every day around 4/5 she begs for food. A couple days ago she didn’t finish her dinner and was acting tired. She is extremely friendly with people, dogs, and other cats, but when people would come around these last few days(my family was in town and my boyfriend came over) she just hid under the bed the whole time. She didn’t eat any treats and was just slowly finishing her dinner from the other day. I grew concerned and took her to the emergency vet. They weren’t too concerned since she wasn’t throwing up excessively or having diarrhea. I also checked her stool and it looked fine. They gave her some anti nausea meds and fluids, and it seems like she has been somewhat fine after the vet. I’ve noticed that she won’t eat unless I sit down on the floor with her and wait until she’s full.

I can’t emphasize enough how food motivated my cat is. She will eat anything and meows at me for dinner. Has anyone else experienced this and can tell me what’s going on? Is she just stressed? I know it’s not her food because I’ve switched her food to see if she’ll eat it and she still acts the same way. I’m also thinking that it may be because I was gone a lot of the time for the last week and would only come back to feed her, and maybe she’s just stressed. It’s still very out of character for her. Also, if there was something stuck in her stomach, I think she would be having a more extreme reaction, like puking or having diarrhea. Let me know what you guys think. Thanks.