Tsubota lay prone on the snow after landing heavily and rolling down the slope, and course officials and medics moved quickly to get her on to a stretcher and off the course for treatment.
Britain's Katie Summerhayes was waiting to start her second run in the final as Tsubota was attended to.
Canadian Freestyle Ski Association president Peter Judge was quick to allay fears over Tsubota's condition.
"Initial assessment is there is an injury to her jaw," he said. "They've taken her in for further assessment. There's nothing other than that - she didn't have a concussion or anything.
"She's in a good frame of mind, it's nothing that we have to be overly concerned about but the injury to her jaw will need further assessment.
"What happened: she just came forward and hit her jaw on her knee. It's pretty common, that kind of thing."