I've seen you asking the same language question in several forums so I guess you really are looking for some suggestions. Frankly speaking, your written English is already not bad, but still, there are grammatical mistakes. And usually HK people's written English is better than our oral English so my guess is, your oral English may be even "worse".
Perhaps it is better to teach her Cantonese at home and let the NET teachers teach her English when she start school a few months later?