Police say Valerie Curbelo, 24, started yelling when she was confronted for smoking and disabling a smoke detector inside a bathroom on the plane.
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Witnesses say that's when she hit a flight attendant and had to be physically restrained by passengers and crew.
The airline says pilots made an emergency landing in Sacramento.
When asked by a reporter why she was smoking, Curbelo answered from jail that it was anxiety.
Curbelo was also asked why she allegedly threatened to kill everybody on the plane.
"I don't know. It was not me. It was not me," she said.
Curbelo was arrested and charged with making criminal threats, a felony.
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She's scheduled for a court hearing Tuesday.
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