Hi Kelly
If your daughter will be going to a local primary school at 6, I suggest you immerse her in Cantonese as soon as you arrive.
Browse the list of preschools in the Tai Po area here:
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Preschools are all private, but some accept a voucher called the Pre Primary Education Voucher. You should apply for it as soon as you can (as soon as your daughter has her visa).
Hope this helps.
Ruth