Ay straight out blitzes, possibly with a few burns, but he does get rid of her easily.
Assuming she's able to put up the Hiding in the Mist jutsu and conceal her location, that trick will only last for a while because i still don't see her killing him with it.
While the mist hinders the vision a lot, its still possible to 'see' attacks coming (
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), if she throws a bunch of hot lava at Ay he should feel the heat, which would allow him to perfectly dodge it.
The acidic mist can melt a Susanoo but that doesn't mean a human will turn into a puddle of blood the second it makes contact with it (
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), if she decides to use this jutsu instead, Ay just has to get away from it in order not to get harmed and wait for it to eventually disperse.
Even she doesn't get blitzed from the get go, i believe its a lost battle as it will be nigh impossible for her to deal any damage, and her chakra doesn't last more than the Raikage's.
Edit: Ups, didn't see the distance Lol Glad my argument wasn't based on that.