This may have happend in the past but unionization of the Delta in-flight staff has been attempted several times prior without success. This particular termination event will not do anything to effect he outcome of this vote, either way IMO.
There is something about human nature that compels staff to remove things from an aircraft. Half empty wine bottles, miniatures, food etc. have been subject to pilfering in years past, but now that is strictly prohibited. Those that choose to do otherwise often face termination. This is not complicated, so if you choose otherwise you probably won't like the outcome. Age is not a factor other than the fact you probably had gotten away with it for many years before being caught. As for 250K per year, not only unlikely, but impossible even with Delta's profit sharing program. More lawyer BSing.The good news is that she will likely get a full lump sum payout on here retirement after being terminated.
FWIW, I think Deta had a male flight attendant retire in the last couple of years who was age 91. Like this current woman, he was a former NWA employee, After all those years you would think they could write a damn good book desiring their experiences.