i sure as heck can relate!!! a friend of mine says to me, "jan, jan, come up for air!" in "race" mode everybody is in the slow lane except me. does your mom know how your "expansive mood" works? perhaps you can sit down and talk with her about this. one thing i've done that helps me to not interrupt, etc is to breathe a little deeper and pause before i jump in with both feet! it's sorta like sitting on your hands but it does help me.
also your mom sounds like a neat lady...she expressed to you how it makes her feel. since you all are close your talking this out will help... and practice, practice, practice that breathing thing.