Barbara Wu, 21, is charged with soliciting murder, making terrorist threats, vandalism and stalking, among other crimes.
Dennis Lin, who dated Wu, sought a restraining order against Wu on May 24, two days after she allegedly asked him to kill an ex-boyfriend. Lin wrote that Wu made him promise on May 22 that he would break the man's legs with a baseball bat, kill him and discard the body.
In his written request for a restraining order, Lin claimed that Wu actually had talked about killing "at least two" of her ex-boyfriends. He did not identify them.
At the request of police, Lin recorded Wu discussing the alleged murder plot, leading to the arrest of the 21-year-old student.
Wu, who enrolled at the university in 2009, was arraigned on May 31 and remains jailed.
Four months before her arrest, Wu sought a restraining order against a former boyfriend, a 22-year-old university student. She contended she suffered physical and emotional trauma.
A temporary restraining order was granted for about two months, but court records indicate Wu withdrew her request for a permanent order.
The next day, according to the felony complaint, Wu followed, harassed and threatened an unidentified man.
The Associated Press contributed to this report.