Looking for Ancestry of Mary Howard

I am looking for the ancestry of Mary Howard, her father was sir john howard of England, ENgleford.SHe moved to Paris,Kentucky and bore three children Luclle, Addie, Howard,she married a gentlemen named Laing, he died in the civil war, I am trying to piece it together and get infor from before this time and after this time, thank you for your time , if you can help