Hi J.,
We just moved to the area, so I couldn't give you any info on schools, but I can on when to start them in school. I have three boys, 11, 7, and 1. And, I also worked in an elementary school as a teacher and got to see first hand the kindergarten (5 yr olds) and preschool kids. There was so much of a difference between the kids that had been to some sort of daycare/preschool environment before entering the "real" school. Those children that had been at home weren't ready for the social, sit still, and absorb day that kindergarten is. It was too much for them.
So, I would definitely advise a preschool (some states offer it for free) at 4 (K4), and even a 2-3 day a week daycare/academy/pre-K (K-3) just to get her acclimated. But, 4 yr old pre-k is almost a must; they will ask if she went when signing her up for K.
Good luck!
E.