Tell her to go read a chess book and that she will probably come back and knock your socks off.
Helping Beginners
Maybe she doesn't want what you want. Sometimes people like different things.
But my first impression is you need to give her some space. You sound very focused on learning and the results of games, maybe this attitude is not enjoyable for her.
I warned her it wouldn't be fun.
My uncle beat me probably a couple hundred of times before I could beat him once. And in all honesty, it took years…
You're rated at 1500.
I'm guessing she's ... lower rated.
There has to be some sort of 'odds given' to square things up when you two play - either spot her a piece or play under different time constraints.
I can play Rory McIlroy competitively on a PGA golf course under PGA rules. Sure, Rory'll be giving me a handicap of 38 strokes.
But that's okay. We know that he's better than I am. A lot better.
Has more money. Better looking. I am, however, taller. So I got that going for me.
The point being is that two people of differing abilities can play a competitive match using a handicap system. Figure out what balances out the equation. As she gets better, the handicap disappears.
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And she also said that she wants me to go as hard on her as I can. She did say that she wanted to learn exactly how I did.
At a certain point, though, consider that this might not be about chess.
I have tried to teach some people here recently how to play. There has been one of them that has gotten really good.
In the small social circle that I'm in at school, she beats everyone (but me). And when she plays me, she makes stupid moves. In all honestly, we have played hundreds and hundreds of games together, and she has yet to come close (maybe once).
She has been really discouraged about the whole thing, and she kinda wants to quit.
I don't know what else to tell her to continue, other than just keep trying.
You guys have any advise for her?