The photo, taken by another daughter with a phone camera, was posted on Snapchat and circulated among students at two high schools in the Wentzville area, the St. Louis Post-Dispatch reported.
St. Charles County Prosecutor Tim Lohmar said both the 50-year-old mother and her 14-year-old daughter had covered their nipples, suggesting they were posing for the camera and expected the photo to be circulated.
The girl has already undergone court-ordered counseling for circulating nude pictures of herself last year.
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