The mother of a young woman whose fatal beating was filmed and posted online recalled Tuesday the pain of seeing her daughter's bloody, swollen face on social media.

"I dream about her," Delores Daniels, Serena McKay's mother, said as she broke into tears at a Winnipeg sentencing hearing for one of the teens who pleaded guilty in the 19-year-old's death.

"I wake up crying and sad that she is not here and wonder what she would have become in life."

McKay's body was found on the Sagkeeng First Nation last April. Two teenage girls, who were 16 and 17, were arrested.

The older girl, who has since turned 18 but can't be named because she was underage when the beating occurred, pleaded guilty to second-degree murder in December. Her eyes were filled with tears as she was led into the courtroom in handcuffs as McKay's family and friends filled the seats.

Crown prosecutor Jennifer Comack said there were 24 victim impact statements from family and friends and more from people who didn't know McKay, including two from people outside Canada.

Judge Rocky Pollack was to decide which could be included in the court record.

McKay's mother, recalling her beautiful and kind daughter, held an eagle feather as she read her statement.

"This has been a nightmare to me," Daniels told court. "How can an only daughter be replaced?"

Court has previously heard that McKay had been at a house party in the Sagkeeng community when there was an argument about alcohol.

Two videos, which later circulated on social media, showed McKay on the ground and crying while she was being attacked.

McKay's grandmother Gloria Lalman told court that when she learned about what had happened, her heart "felt like it had been pierced with a sharp object."

McKay's death left a permanent void in the family, she said.