Wu worked with Cameron for decades, dedicating her life to saving women and girls. Between 2,000 and 3,000 residents passed through the Presbyterian Mission Home from its opening in 1874 through the mid-1930s. The rescue mission workers received violent threats from brothel owners, but Wu was especially targeted, because she was perceived as a traitor. Wu received taunts and threatening letters railing against her for cooperating with whites against her own people. Wu took on more responsibility at the home in the 1930s, making public appearances to raise funds and guarding women who had testified against human traffickers. She also vetted potential husbands for the young women in her care, ensuring the men were Christian, had jobs, and would treat the women well. As for herself, she turned down multiple suitors, joking that "men are very useful when it comes to moving furniture."
