Could be Gabby showed them what you get when your a sweetie pie.
Mudgey and Grace got curious as to what all that petting and kissing stuff was and decided to give it a try.
I had a very abused and starved kitten brought to me one day. I kept him in the bathroom and would just sit there not staring at him. It took him a long time to come out when I was there.
When he was better, weight wise, he was brought into our bedroom. I had another abandoned (by people - not her mom) kitten there too. She is my baby! Wiley and bear hit it off and Bear showed what nice people are good for. Wiley is so sweet and loving with my husband and myself. But when strangers come to the house - they do not even have to come inside, just to the door - Wiley is the first to yell, "Stranger Danger!" and hide.
Bear will usually go find him and bring him back out.
So yeah, I bet Gabby gave your mom kitties a little boost. :)