we have lots of kids in a small house...so this often happens, and they come up with 1/2 the convo or something...we are quick to let them know that the convo wasnt for them, and they are to stay out of it...or they need to find something else to do, as we are having an adults only convo...or we are on the phone, and unless someone is bleeding or dying, then they need to wait...it really depends on the child, the situation, and how important the convo is...the kids know not to look over our shoulders at the computer...that is a personal space thing to me, so its important to me...and they also know that any mail that comes into the house, whether it has their name on it or not, is ours...we do this for safety reasons that i wont go into at the moment, but since we (the adults) are paying for the house, then anything that comes into it is ours...when we have handed the mail to them, then they can do with it as they see fit...
if you would like your child to give you privacy about these things, then you should tell her...in the big bad world, people do not appreciate others who "ear-hussle" or do other things that invade personal space...that might need to be explained to her...if *you* are not comfortable with it, then explain that to her as well...it was ok when she was a small child, because she really didnt understand...now that she is older, its not ok...if she has questions about things, that is one thing...but if she is hussling for the sake of knowing the info, then thats not really ok...
peace...