Apparently, her reaction to the manner in which the purser presented the nuts to her was a bit out of proportion.
This particular executive was in charge of in-flight services and has resigned from that post.
According to the New York Times:
By Tuesday, with many South Koreans calling for a boycott of Korean Air, which they nicknamed “Air Nuts,†the airline announced that Ms. Cho had resigned as the head of in-flight services, though not as a vice president. “I am sorry for causing trouble to the passengers and the people,†Ms. Cho said in a statement on Tuesday. “I seek forgiveness from those who were hurt by what I did.â€
The New York Times also pointed out that her demanding the flight go back to the gate (as well as screaming at the crew) may be in violation of aviation law.  Food, specifically nuts, for thought.