I think it's great what you and your husband are doing!
It encourages your child to explore her interests. I personally feel that it is more important that a child enjoys what he/she is learning, than to be forced to learn what she "should" be learning (haha.. we have our schools for that!).
I highly doubt that she will be left behind. She probably cultivated a great habit of learning from being able to explore her interests. This will probably equip her with the necessary skills to learn what she need to in school when the time comes.
Just my two cents. :)
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