Mistaken identity

While introducing me to a friend at church yesterday, my mother-in-law said that my name was Tammy.

Tammy is the name of an ex-girlfriend of my husband's from over 6 years ago. He's referred to her several times as crazy.

I'm not sure if I should be more concerned about the fact that my mother-in-law (WHO I LIVED WITH FOR NINE MONTHS) is confusing my name with a crazy person's or with what this says about the state of her memory at 61 years old.