Sorry that I missed your post since I don't come in to check the forum often anymore these days.
For (1), you being graduated from SH School of Commerce is not relevant at all in the consideration on the point system for the application of SHCS in the Discretionary Places stage.
For (2), you should simply apply on the earlier year and be considered rather than giving up the chance and wait for the next year when your young one could then be possibly considered too "mature" for K1.
Hope this help and hope your daughter enjoy as the kindergarten has commenced.