My little sister wants to start playing league

This is probably a bit of a random post but I genuinely have no idea where else I can ask this. So, me and my little sister (13) watched arcane together and now she wants to start playing league. I think she’s already played the mobile version but from my understanding that’s different to the one you can play on pc. The thing is, I don’t know if I should let her. She doesn’t have a pc of her own so she wants to use my laptop to play it, and with other games I’m normally fine with that but I’ve heard a lot of things about how toxic the community on there can be and I don’t really want her to be exposed to anything like that. I don’t know how bad exactly it is because I’ve never interacted with anything league related outside of arcane, but If it’s as toxic as everyone seems to say it is then I don’t really want her playing it unless there’s a way to turn chat off or any different game modes that have less toxic people on there. Any advice is appreciated, thank you :)