Ok, So I know the title is confusing but this is gonna require a lot of explanation, so I'll put the TL;DR at the bottom.

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So basically there's this girl who I'm friends with (we'll call her TJ). She's a pretty odd character, and we're decent friends. There's rumors of her having a mental disability but as far as I know, she isn't officially diagnosed, and just acts strange for the thrill of it or whatever. 

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So one day she invites me to a live stream on Instagram. I join and pretty soon, challenge her to the titular 20 dollar Smash Bros. Ultimate money match. At first, she's completely against it, calling me evil and stuff, but then she slowly warms up to the idea and pretty soon she wants to take the game.

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So you might be wondering why this is on AITA, but she has told me she's never played the game and she might have a disability, but she's now vouching for the game. On the one hand, I don't wanna extort money from someone I know will be an easy stomp, but on the other I don't wanna turn her down, given she's been talking smack (that she'll beat me, your average pre-game trash) and a part of me wants to prove her wrong. WIBTA for taking the match?

TL;DR: WIBTA for taking a 20 dollar smash bros money match against someone I know won't win?