[Lula-Mae Famous]

I took Lula in for shots a couple days ago (it’s a bit too early to reach anyone at my vet’s office). I came home yesterday and she was curled up on the couch when I sat down next to her so curled up as close to me as she could and cuddled my for a good hour. I had to leave for a meeting and when I came back she was still looking to cuddle up and was what I would describe as “sleepy” (lethargic?).
Last night while in bed she started panting. She has never done this (aside from vigorous play or very hot summer walks).
Obviously I plan to talk t my vet but was wondering if anyone else has experienced this type of reaction after vaccination shots.
Any information is helpful.