Lilly Millet is a ranch maid, who has failed to pay back her loan to Leopold Strauss. She lives around Emerald Ranch, with her boyfriend Cooper. She and Cooper are seen arguing. When Arthur approaches to collect the money, she will tell him that Cooper has the money, and tells Cooper to give the money to Arthur. Cooper, however, would rather fight than give up the money. Arthur quickly beats him senseless, and after Cooper has been defeated she will begin crying. She tells Arthur to take the money and leave.
In Annabel's letter to Miriam Wegner, Annabel states that Lilly was always sensible with money and believes that Cooper is the cause of Lilly's financial difficulties. Annabel states to Miriam that Lilly has not seen her outside of the ranch for months.