Information Wanted on Rebecca Orr Abt 1861 of Alabama

I need information about Rebecca Orr She had children 5 Dautghers and 1 son with a George Jack Thrasher. She moved herself and the children to Chicago in the 1900. Then she married Robert McCall.All the children used the last name of McCall. Any information about this family, Why the name change and what happened to George Thrasher would be great.