I didn't see anything in any of the articles that she was working at a pill mill.
The articles say she was arrested forpossession of 6000 doses of tramadol.
Usually if someone is working at or operating a pill mill, the charges are for overprescribing, health care fraud, drug conspiracy, drug trafficking, conspiracy to distribute, or something similar.
Possibly these were for her own use? Or the authorities could be planning on amending the charges after an investigation.