No way to ever know, but I’ll just bet your Mom knew all along the truth about your statements. She may have known that you had a good sense of humor and saw yourself as a smooth talker, who could spin a good yarn. So she went along with it, because it was good for a giggle.
It was a way to bond with you, and it would cost her nothing to say she believed you. My late Mom was the same way.
It’s hard to surprise somebody who already knows you.
“No way to ever know”
Sure there is. Anyone could ask me or her, we know. Now You do too.
Moms are nice, you’re right.