Have you considered to let your daughter fly to the US (if she is allowed in) and let her cross into Canada from the US? CBSA explicitly states that those with a study permit approval letter (regardless of when it was approved) can enter Canada from the US, including foreign nationals, of the travel is deemed essential. Does she have an approved study permit?
Good luck.
My daughter's case is hopeless as she is not a US citizen, she is a scholarship student from Europe who is into her 47th week of waiting to come to start her course, whose fellow returning international students on her identical in person course arrived by plane from Paris last Wednesday and Thursday and are in quarantine. Her only sin is to be born in 2001 instead of 2000 and for her university to have dragged its feet for 4 months, slowing down her application for CAQ then SP, meaning if they'd issued it immediately (as they could as she'd achieved her grades a year earlier and was on a gap year), she'd have been on that plane. The university dragging its feet and circumstances have led to her being left behind. She is gutted. She is no more risk than the other students who got on the planes last Wednesday and Thursday.