My friend got banned on competitive last season for leaving one game and hasn’t been un banned
It actually takes more than one leave to get a season ban. Please note this includes all disconnections and technical malfunctions. If he has had three season bans in his entire history it may be a permanent ban from Competitive Play
This seems like something your friend would have already tried to make a ticket about and feels like if that’s the case Blizzard would have already explained to him why.
One it’s a female and 2 she hasn’t put a ticket because she said blizzard won’t do anything in the first place and 3rd its only her second ban
Well, only Blizzard can look up your friend’s account status, and that can be done only through a web ticket.
Can they un ban her?
Only if there is a proven bug when she submits an appeal, they can look up her account and determine if she was banned in multiple seasons.