I can't give any anecdotes of my own as bad as that, because my mother does take an active interest, but I always get the impression with her that its not because she is genuinely interested in me - but so she can tell her friends and they will award her "points" because of my achievements.
Sorry, it was your "I'll just get a pen and paper" thing that reminded me of this trait in my mother - she often makes what I suspect are "boast notes" when we are on the phone. (Dont get me wrong, there's not a lot to boast about these days, but when you are in your late teens and early twenties and forging a path in life, there is plenty, generally)
She's never taken the time to try and understand or listen to any detail of any kind about what I did as a career, if I ever talked about work or uni she was actually so disinterested her eyes would glaze over, yet when it came to a tangible "boast", something really great happening, she would grab it and ram it down everyone's throat, lapping up the glory.
Not quite the same thing, but you have my sympathies, I sort of, in a roundabout way, know how you feel.