person A: My old elementary school principal saved me from drowning when I was in 1st grade.  I'm eternally thankful for her and hope she's doing well wherever she is now
person B: thats an amazing memory to have_comma_ have you since visited her or sent her a card? 
person A: That's a great idea but I don't know where she lives
person B: I would call the school and see if they can disclose that or maybe they can accept the card from you to give to her! 