chance for non-ESF kindergarten to CWB school

Ask for a friend of mine.
She is from mainland China, husband is a foreigner.
She wishes to put her daughter to local kindergarten for K1, K2 to learn some Chinese.
Then switch the little girl to CWB school P1.

The little girl is born in HK.

According to ESF, they should be category 1.
So do they have chance to go to CWB If so, is it a good chance or small chance?