She will still indicate herself when she needs more nursing, so unless she's asking for it I would say no. In fact my boy nursed less at his 6 month shot, since he was cranky from it. I would go by her cues and try to stay on routine as much as possible.
The reason the sheet says to make sure they get enough fluid is that sometimes kids feel sick from the shots and don't eat or drink at all. As long as she does her normal feedings (or even a little less) she'll be fine. If she flat out refuses then more often BF is needed to keep her fluids up. By now she' also old enough to have some boiled water as well...
Hester