Am I overreacting?

Jessica • Momma of a 3 year old boy, married to my best friend.
So my husbands mom had a still born that was born st 8 months over 20 years ago. She believes in mediums and thinks everything they say is right. She calls me today and says that the medium told her that my baby is her still born baby coming back. I'm overly pissed right now.. Am I overreacting about this?? She continues to over step over and over again.