Hello everyone! I am a green cheek conure -Mango- owner for about 6 months

. We visited an avian vet -which we know that it was a good one-, Mango got her first basic avian exam (fecal, throat cultures, bloodwork, nail & beak trimming) and sexting test. Right after we came back from the vet, Mango was unhappy, a little bit fluffy and sleepy. Today is the day after our visit, Mango is still pretty sleepy (she is actually even a little bit nippy in her normal days). She is eating and drinking well though. But I am very worried

, I called the doctor and he said it is not normal after a basic exam and I should monitor her overnight and take her back if things do not change. I rented a car to go there and now I returned it (definitely will rent again of I will have to though)

Could it be any behavioral problem? The weather was hot, I opened air conditioner in the car (but not directly to her and she was in the carrier). Maybe she was scared to see any other people and kind of traumatized because of her first experience? Please let me know if you experienced it before or have any idea. Sorry for my long post, and thank you so much!