Don't forget in April 64 there was a plot to kidnap Lincoln at the Soldier's Home using Col Johnson's Maryland cavalry. It's possible that word leaked to Washington operatives on the street but I doubt the old biddy heard anything. I can't remember what I had for dinner last night so I doubt she could recall a random 3 year old conversation on the street. I could be wrong but I'm sure John Fazio would have destroyed her on cross-examination.