cheaters

there is a viper that is currently 36 and 0, but she;s using aimbot. the match isn't ending, and she's very obviously cheating. What tf is happening to the anti cheat system? the picture is from 10 minutes ago. How does the anticheat not pick thisb up? Game is over now. Riot gave a me a 14 rr loss. Viper finished that game 39 and 2, and she's unranked.