Trolls in ranked promos..

So what exactly are you supposed to do when theres a troll or an afk in youre ranked games?? Aside from report them, take the loss and move on, is there even anything that can be done? I had at least 4 games in my provisionals where someone went AFK or started to troll, and then i get a jungler that invade level 3 after we tell her not to and she gets killed, starts flaming the team, told us to "enjoy the 4v5", and farms her jungle and gives the enemy team kills when they see her..? I just find it incredibly stupid that people have to take losses and lose LP for one persons childish decisions. Idk, just hoping Riot finds some way to deal with this if its at all possible.