A parent who needs some help for her kid....

Hello, my daughter LOVES Rocket League and I am told she is really good. Problem is she is 9. Every time she gets in to do a tournament with others and/or finds someone to play the game with they are fucking with her or refuse to play with her because of her age. I get it if you are older... but no one is dating anyone....last I checked everyone is there just to play the damn game. Is there a way I can help her find people who actually want to play the game/tournaments with her... If this sounds ignorant or all over the place it is because I have no idea what I am talking about. I'm just trying to find others for my kid to play a game she loves with.... If there is another group to ask, just let me know... please no hate comments I am old and tired. :-)