Is refusing to kill the enemy players and with that letting your team die punishable?

I just played a Normal Draft game where we had a Katarina mid lane who refused to kill the enemy mid Wukong, instead they were farming and not hitting each other. And for the rest of the game, she almost never went in and helped the team, she literally just stood at the side while we tried to fight, visibly just refusing to help at all, gain an advantage. It honestly felt like she was keeping us hostage in a losing game that had no other outcome but that. It really sucked. I reported her for Griefing and Afk, since she practically was. I mean, that's Assisting the enemy team, right?
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