I honestly don't know what is going on with the Cathy plot since it's so segregated from the rest of the show except where she's getting supply. However, when she was hiding the smack in the bathroom and the daughter startled her, the daughter asked, 'when are we seeing dad again', and she said 'we're not.'
But again, I'm not sure how she's selling in the first place. They implied she was selling it in the prison, but if Frankie is gone, who's the hook up? They're not showing her selling on the street or what.