If my sister feed directly on a malunggay (i can't find the right terms haha) like nilaga, than have it mixed in an ulam - will it give her a better milk boost?

Of course it will. :) malunggay, regardless of the way it is consumed, will not be less of a galactagogue. In fact, my cousin used to do this starting her pregnancy until her baby is 4 or 5 months old. She would just sip boiled malunggay juice and up goes her milk supply.

My ob-gyn explained that the milk is all about the mind. Malunggay and other food or liquid that we are told to boost milk supply are just a placebo effect. However, staying hydrated is still important.