Isabella Guzman
Isabella Guzman is accused of stabbing her mother 79 times in the face and neck. HLN

A Colorado teenager accused of killing her own mother by stabbing her 79 times appeared in court to be formally charged with first-degree murder. Isabella Yun-Mi Guzman, 18, is being held in the Arapahoe County Jail after stabbing her mother, Yun-Mi Hoy, 47, on Aug. 28, according to HLN.

Guzman was originally scheduled to appear in court on Thursday morning, but the hearing was delayed until later in the day after the teenager refused to leave her jail cell, KUSA-TV in Denver reported.

HLN reported Guzman and her mother had been viciously arguing in the days leading to the murder. Guzman’s stepfather, Ryan Hoy, told police that Guzman became “more threatening and disrespectful towards her mother.” On the day of the murder, Guzman allegedly sent her mother a threatening email, reading, “You will pay.” Later that same night, Hoy told police, he heard a noise from the bathroom where his wife was showering. When he approached, he saw blood underneath the door.

“Hoy then observed Isabella Guzman standing in the doorway holding a knife,” the affidavit reads, according to the Huffington Post. “Hoy advised that he never heard Guzman say anything and that she didn’t speak to him as she exited the bathroom ... [she] was just staring straight ahead when she walked past him.”

Guzman fled the scene, but she was arrested the next day at a parking lot near the house, 7News reported.

According to HLN, Guzman stabbed her mother 31 times in the face and 48 times in the neck. If convicted, Guzman faces life imprisonment without the possibility of parole or the death penalty.