Even I'm the parent of both SC and GH Primary. But I have different point of view on your case.
Change school is not easy for the kid to adopted. She enjoyed so far with the familiar enviornment. If I were you, I will keep my daughter in this school until gratuation.
GH Kinder is a brand new school, nobody knows their teaching way. And NET teachers when they were young is very very important and key point to sucess.
Several years ago, I got the chance to put my eldest daughter into really "One Dragon School from Kinder - St. Rose of Lima". I still put my daughters to SC instead, I prefer take a risk for other steps. Foundation is very very important for our kids. Think from more angels before you make any decision.