i got chat-banned when i wasn't using a curse word.
You don't have to curse to merit punishment. In fact; swearing is perfectly allowed, so long as it's within reason and not leveled at other players.
...but because i tell her what she did wrong on play league(rank) i got chat banned and lost rank reward and everything.
And how, exactly, did you tell whomever that they played wrong? 'Cause, if you spent much of the game harassing them and being negative, that would naturally be grounds for a punishment.
You should provide your full, unedited chat logs for peer review, because the community isn't going to simply take your claims at face value.
Otherwise, if you really want to appeal your punishment, you should file a Support Ticket. The community (who you are reaching out to by using the boards) can't do anything beyond explain the reason for your punishment and discuss your behavior.
But bear in mind, Riot typically does not overturn punishments unless they were truly given in error, and as far as I know (which is very little, admittedly, due to not having seen your chat logs), there's nothing to suggest that this punishment was in error.