What does Della's action of cutting her hair to buy Jim a gift reveal about her character and her relationship with Jim? What does it show about Della's conflicts, motivations, and traits?

This question refers to O Henry's short story "The Gift of the Magi." Delia's action shows that she loves her new husband Jim enough thst she is willing to sacrifice something she values in order to get him a Christmas gift. She has an unselfish, loving character.