Stilling?

I have never ever heard that word (I also checked in google just in case) , but I know it happens, PTSD is all about reactions that the subconcious mind produces to not go over the same experience again. That means the reactions are simmilar to the survival ones, an example is as you have said suddenly stay very still and trying to become somehow invisible to prevent something happening to you when the brain tells you that you are in danger because it recognises a signal that has a relation with the traumatic event, it's all psicological of course but it can be very exausting as it takes a lot of energy for that reaction. I also think this could keep happening in the adulthood if it's not treated.

It sounds to me like it's where you (not specifically you but someone in general) want to try to not become scared and feel weak so you try to be as outgoing as you possibly can but when you hear someone yelling at you or someone tries to hit you you go back to that weak and scared person who doesn't know what to do. Because of the abuse. So I believe that's what she was trying to say. That's about the all I can think of

Thanks both of you!!! I really appreciate it!!!