Erika Menendez spoke to The New York Post on Friday at the city jail where she is awaiting trial in the killing.
Menendez tells the newspaper her "mind was just racing" the day of the attack.
She says, "I was homeless. I was hungry. I was fighting with my boyfriend. He came running up the stairs, and I just got up and pushed him."
Menendez says she picked her victim because of his ethnicity.
Slain 46-year-old Indian immigrant Sunando Sen was Hindu. Menendez says she has "been beating up Muslims and Hindus for a long time."