I sure hope your little one feels better soon. Whenever my Sophie gets shots, she gets very sick, sore and lethargic. I called my vet, mainly because i was concerned with her tiny size, and they had me bring her in for observations. Turns out, she was having an allergic reaction. From now on, any time she has to get shots, they pre-medicate her before giving her the shots, then keep her for the day to observe her. It was pretty scary the first time it happened, she just wasnt herself. I would recommend that you call your vet. Better safe, than sorry!
Hope she feels better soon!