So th key words is “up to”, so very unlikely she will get.
If the passenger had assaulted the cabin attendant to the point of incapacitation then what would be suitable sentence? What if there was an evacuation afterwards and due to the incapacition passengers died, then what would be a suitable sentence?
When the passenger decided to assault the crew they did not know how the flight would end (evacuation or not) or if a blow would incapacitate the crew. Due to their selfish actions they potentially put other crew and passengers at risk for no reason.