I am of the opinion that if the school is not teaching it and my DS is ready and excited to learn it, I will do what I can within reason at home.
Again, my opinion, but hothousing is "pushing" kids beyond what they are interested in, and in some cases ready for, to meet your own agenda--and taking away their time to be a kid in the process.
By teaching ahead, you're trying to help your daughter get the acceleration that she needs to meet her potential and be happy and challenged at school. Not hothousing.
