She will enjoy it, my daughter did at that age (Disneyland), but sadly, she doesn't remember a bit of it now (she's now 6). If you waited a year, I think she would get more out of it for sure.
x2.
We have friends that took their 6, 4 and 2 year olds, and the youngest doesn't remember anything of it.
If you do go, get one of those smoked turkey legs that the vendors sell. Unreal tasty.
R35