If you don't need it (for childcare) and your child is happy at home, I'd say "no thanks." Developmentally, at this age, they will engage in "parallel play" but not really play "with" another child until sometime after the age of three (on average). They won't really develop "friendships" so interacting with other kids at the playground, even if it is new kids each time, is almost as beneficial as a preschool setting.
If you child is gifted, you'll be much better able to nurture her unique gifts at home than a teacher will be able to do in a preschool setting where she has the needs of a large group to consider.
Maybe reconsider preschool when she is three!
