Erika Menendez, 33, pleaded guilty to first-degree manslaughter in the death of 46-year-old Sunando Sen.
Erika Menendez will be re-examined by a defense psychiatrist.
Erika Menendez was transferred to Elmhurst Hospital's prison ward for women with mental illness.
Sunando Sen, 46, was killed when a woman pushed him in front of a 7 train at 40th Street in Queens.
Sunando Sen was shoved in front of a train at 40th Street in Sunnyside. His attacker remains at large.
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