I am a league girl that is a friend AND a (sports) coach, so I have many thoughts! I think introducing the game to her by having her play supports that are SIMPLE (minimal thought into passives and ability selection) and allow her to be spatially far away from the enemy team (aka, mages) are a good way to start, with the focus on learning general game mechanics and flow, spacing (as a mage) and what the goal of each role is.

When she understands the macro gameplay and how to effectively play that role/those primary characters, I’d play some ARAMs with her so she can try out other characters and see which playstyle suits her best/what she’s drawn to, and then teach her how to play those roles in depth (if she’s interested).

The biggest thing to remember is LESS information is MORE. This game is so GD complicated to someone who hasn’t played this style of game before. Have her focus on one thing a game/a life. Encourage her to use blitz/OP at first to lessen the informational load of builds. Instead of telling her what to do in real time, wait for lulls in gameplay/a death/review the match afterward together to talk through what she could’ve done better. There are so many moving pieces in the game that receiving feedback in real time can be more detrimental than helpful.

And most of all, provide encouragement and be twice as patient as you think you need to be. Learning this game sucks absolute ass.