Scott, the 44-year-old mother of four, has worked as a prostitute since the early 1980s to fund her longtime drug addiction, friends told the newspaper for its Monday editions. The recent arrests have been since May.
Mariah, 35, has repeatedly paid for her sister's efforts at rehab, but this time, one of the singer's reps told the Post, "She's looking for Alison to want to help herself."
"Mariah can be there with love and support -- but at what point do you not enable someone any longer?"
A source close to the family told the newspaper: "Unfortunately, Mariah is having to learn that you can't help someone who doesn't want to be helped."