That Brennan Girl is a 1946 American film directed by Alfred Santell. It stars Mona Freeman and is based on a story by newspaper reporter Adela Rogers St. Johns.
Eight years earlier, her vain and corrupt mother Natalie asks Ziggy to pretend they are sisters. Together they trick men out of money. Ziggy takes a liking to a con artist, Denny Reagan, and steals a soldiers watch that Denny admires.The watchs inscription gives Denny a guilty conscience, so Ziggy gives it back to Mart Neilson, the soldier. He asks her on a date, which leads to marriage and imminent motherhood. Mart, however, is killed in the war. ........
Source: Wikipedia