Laureth "Laurie" May, 29, left her home Wednesday after arguing with her fiance. She took her sons, 4-year-old Quincy, 2-year-old Oliver and 1-year-old Spencer, with her.
Friday, police report that she may have used her credit card Thursday in the Gary area and there was a possible sighting in Hobart.
May used to be a teacher. A 17-year-old Cicero girl who used to be her student is believed to be traveling with her.
Anyone with information should call Aurora police.