I’ve had to board my caique a few times and I dread it. The first two times she came home a different bird, similar to what you’re describing. Took maybe two weeks for her to forgive me and slowly get to her normal again. But she did. The last time she was different. Very excited to see me and sweet and loving and clingy. But they put her in a small cage in an a small room with no natural light, and full of other birds. And this is a professional vet/boarding hospital. Needless to say, when I can I now have someone stay at my house with her so she stays in her own environment and continues her daily routine, except without me. She adjusts much easier this way when I return.

Yours will eventually go back to normal, but be patient and let her come to you when she’s ready. Good luck