What does she mean by 'down'?

So this girl posted a story on her Instagram that says "imessage games anyone?" I messaged her "Let's play" and she replied "down". Does that mean she doesn't want to play with me? Not that it's a big deal for me if she doesn't want to. I'm just a little confused.... show more So this girl posted a story on her Instagram that says "imessage games anyone?" I messaged her "Let's play" and she replied "down". Does that mean she doesn't want to play with me? Not that it's a big deal for me if she doesn't want to. I'm just a little confused. English is not my first language. I've only been here in the US for about 4 years so I still have a lot to improve with my grammar.
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