Can you ignore your sister or leave her presence?

Someone from a group culture explained to me once that enforcing boundaries in it is just done more quietly. You do what you need to do without announcing it I think she was saying.

Maybe you are making a lot of noise when you are attempting to enforce your boundaries? When a person becomes confident in their power they realize that not everything is a threat to them and you aren't to this point yet so you feel very threatened and make a lot of noise? I hope that I am making sense.