Dbrhodes on Family Tree Circles

I am in the middle of my family tree, and I have also hit a brick wall. I need some info on Margaret Jane Costello. She was born in 1917 in Philadelphia PA. and died in 1987 in Columbus (Franklin) Ohio. From what I have gathered this is the same Costello family to be related to Princess Grace Kelly. After looking into Grace Kelly's family tree I can not connect the dots between my Costellos and hers?

Thanks!!!