But she wasn't going to receive the drugs at that point. Because the pharmacist already knew the call-in was bogus. He would have had to knowingly fill the Rx and hand it to her as part of a police sting. It's one thing when cops use confiscated street drugs to run a sting, but it's another thing entirely when a pharmacist uses his own inventory this way. Ordinarily, those drugs can never leave his possession, unless they're given to a legitimate customer or returned to the distributor/manufacturer. In either case, there's required paperwork.
She was amazingly dumb here. Call-ins, even with a DEA number that checks out, are often called back. The pharmacist will look up the physician's office number from a phone book, rather than rely on a phone number given to him by the caller. There are just too many ways to get caught at this.