Here's the dirt I've heard. This from a mutual friend who talked to the captain when he got back (so it's second hand, but I consider the source reliable).
They left ATL late because of a pax injury. Got to LEX and the FA was acting very strange. Mumbling strange things. Stumbling up and down the aisle (she had been fine in ATL). In cockpit resting her head on her arms while saying crazy things during boarding. This is when she made the comment about having drunk a Jack on the way up. The captain was put in a bad position because everyone had seen her stumbling around and heard her make the Jack comment. This is why he HAD to call it in instead of covering for her (tell her to call in sick).
The crew suspects that she had taken medication on the flight up, something like Xanax, chased with the Jack, that caused her to act that way. This is all that would explain her being wasted at 0.032 BAC. And yes, she did initially refuse to be tested, and did tell the Captain "you're dead".
She is off line for the whole month, and has not YET been terminated. Being a FA on probation, I think we can all agree that she will be, but probably for the "trip failure" not the incident itself. That clears ASA of liability since the 0.40 alcohol policy apparently wasn't violated.