As long as her gums are pink and her face/cheeks are not swollen, and she's not terribly lethargic - I wouldn't worry tooooo much. I'd encourage her to drink a bit more water - maybe sweeten it w/ karo or honey.
Depending on which shots they gave - they may have given it in the side of one of her back legs, and that can get quite sore. Sort of like - have you ever gotten a shot in your shoulder muscle and it hurts like heck for a few days? It's like that. So, she may be favoring it, or shying away from you touching it. And, yep - shots can make them tired and worn out. So, just keep a close eye on her and try to keep her hydrated and get her to eat if you can.
