In my experience early reading doesn't make people "get" your child. Really precocious reading is sometimes totally ignored because people simply have no frame of reference and don't even process that the kid is actually reading. And, of course there is also the option that people will suggest the child is hyperlexic, autistic, or some kind of savant.
If there is something specific your daughter needs at preschool that she isn't getting I would talk to the teacher about it. From where I sit preschool was the best time because playing outside, playdough, blocks... it was gifted neutral.
