POSSIBLE-Understand this is unproven, but I have a daughter of Robert and Elizabeth Delashmutt Ivers, Elizabeth Street Ivers, who may possibly be the Elizabeth you are seeking. Robert is on census in Clay Co. IA in 1850 with children listed. You could check the ages and see if it is possible. Please let me know if this proves to be so, as I am "collecting" old Ivers. Depending on dates, she could be from Richard Ivers Jr., if the Elizabeth Street Ivers doesn't work.