A real bean sidhe (banshee)?

My wife amber has do e things that I can not explain including predicting what woud happen prior to its occuring. She studies and knows magic and has whether by coincidence or not affected the lives of many people through the years. She is descended from a very high family of welsh royalty but her family identifies with a place called anglelsey. She is a loving an extrememly intellegent woman but does things that make me nervous. Our daughter she insisted upon calling Morrigan in honor of her "friend". I don't know anything about these things but have read about the significance of a Morrigan in Celtic mythology. Is there evidence of people knowing things from ancient times that can be doented or is this a case of an otherwoise sabe ab prosperous,educated woman believing too many of the stories ped on by her family? She is a great woman but does see to know and do things that make me wonder. To include having me tatoo Bean Sidhe and Bean nighe on my body. Advixe would be appreciate.