It's amazing how we humans can talk and interact with each other so much and yet still there is so much to learn, isn't there?
Not everybody comes out of a large family talking this way, but I would bet it definitely plays a role, along with regional and other differences.
I hope phone conversations with her get less frustrating--sometimes we overlappers scale it back a bit--but do you ever interrupt her? Does she mind? I'd be really curious if to know if she notices when you interrupt!
Thank you for reading--and good luck on those phone calls!