How can someone going full tilt going 0/27/2 in three games, not buying items, still be playing?

I got stuck with a Karma one game three games ago going 0/9/0 going on full tilt. She didn't buy items. She didn't really CS. She was recalling next to the enemy who were up multiple levels and items. This was platinum ranked so just having a bad game/day is not a possible explanation. I checked this player's and apparently the next two games this player did the same thing. Can someone please explain me how I can cheat the system and be just as cool like this player?
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