H.K.
I agree with Tania...
The word "No" has be VERY different in tone and meaning from everything else. In our case we always made it "swift and terrible". When we were teaching our children "NO" our expression, tone and deliverance changed from anything else they experienced. It got to the point where I wouldn't even have to say it loud or with much authority. I could do the clentched teeth, wide eyed, "mom look" and say "no". They would stop whatever they were doing instantly in order to not get that response from me.
So use it, use it only when you need to so that it means something. Instead of "no" when she is touching something for example, say "don't touch" because that is what you mean. Reserve the no for when you need to shut her down and shut her down quickly.