Would like to seek advice from experienced mom and dad.

As my 3 years old++ girl all the while been taking care by my wife at home with mandarin speaking environment (I also speak mandarin to her ).
She is having difficulty to speak english and interact with friends in the PCF 3 hours nursery program. And I start to notice, seems this had affected her self confidence now.
I was thinking is there any english program to improve her english at her age?
Appreciate if there's any opinion.
Many thanks.