A Crown prosecutor says the young woman who threw a chair off a downtown Toronto high-rise balcony is "lucky she didn't kill someone."

However, a judge will not sentence 20-year-old Marcella Zoia until March 12, following a day of submissions at a Toronto court.

The prosecution is seeking a four-to-six-month jail sentence for Zoia, who pleaded guilty in November to mischief causing danger to life.

Crown attorney Heather Keating says the chair Zoia threw in February 2019 plummeted 45 storeys onto a busy sidewalk where 20 people had been walking — and next to two busy roadways.

The defence is seeking a suspended sentence that would mean Zoia would not spend time behind bars.

Keating says the fact that Zoia knew she was being filmed and the video was uploaded to her Snapchat account is an aggravating factor in sentencing.

The video of the incident went viral making international headlines that led to a plea from Toronto police to identify the woman throwing the chair.

Greg Leslie, who is representing Zoia, is arguing for a lighter sentence, noting the woman's young age and the fact that she was intoxicated at the time and being peer-pressured.