Aww, poor little girl. Did they give her pain meds?
Our first dog Bandit was completly out of it until the next morning, and then was pretty groggy until the day after that. Nala however was awake and a bit groggy when I picked her up, and by 9 or 10 that night was her normal self. She seemed to be in no pain, but since she was SO active the vet suggested giving her the pain meds anyway to keep her a bit sedated so she didn't tear her stitches lol.
She should be a lot better tomorrow, and there's nothing wrong with calling your vet to double check