I really have no idea! I've been wondering my head off since it happened. When she got on my bus she already went "Oh, I'm so happy you're driving! Thank you so much! You have no idea how happy I am that the bus is here! I'm so happy!" and when she got off she did it again, so I just said "Well ma'am, that's what we're here for, glad to be of service!" and she responded with "Ah, that's what you say, but you have no idea how important this was. Have a happy New Year's Eve!". I was so dumbfounded I missed the next stop. And I'm still clueless to this point.
