In the scan I posted you can clearly see that Susanoo that hit Mei had to jump to her (look at its leg). In time it hit her, its hand was almost completely melted. The distance and melting speed is impressive, like it or not.
So? It jumping doesn't mean that she was a "great distance away"
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Ok.
Firstly, since Hiruzen has no knowledge of Futton, after she'd used it, Hiruzen's clones wouldn't even get any time to react since a single stab makes clones poof. Continuous damage from every angle affecting whole body is more than enough to render clones useless.
Intel is full. So yes, he has knowledge of it. That makes this point null.
Moreover, I don't know how Edo Bodies exactly work, since Kishi messed up on this part, but Hiruzen clearly got a chakra boost in his Edo body. Orochimaru was surprised Hiruzen rushed at him without Kage Bunshin but
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by an Anbu member.
Wrong. They have no chakra boost. Shown when they couldn't make more clones when the Hokage barrier was up. All that means is that Kishimoto retconned Hiruzen's abilities, and scaled them up to Part 2 level. Every other Edo has had no chakra boost, bar Madara (since his alive self didn't have Hashirama's DNA, which boosts chakra levels) and Minato (Who did not have Kurama) Edo Tensei was never stated to boost chakra anyway. It gives unlimited chakra, as in the chakra will always regenerate.
The only reason Hiruzen used his Kage Bunshin was because he knew he was going to suicide, so chakra was
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anymore.
Read above.
You are wrong. Mei is resistant to acid and lava. She lets it drip from her mouth on her skin. And no, ninja aren't immune to their own jutsu. Look at Deidara running from his own bombs for example. Moreover, Sasuke example of using his Raiton on his own body is often brought up. But it's false. Sasuke's own Raiton
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him.
That's her own jutsu. Pretty sure Sasuke isn't immune to all Katon just because he can hold his own Amaterasu. [
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] I have no reason to believe she is injured by her own jutsu. No reason at all.
So it's not that Mei is resistant to her techniques only, since no one is. By some unknown means, her body is resistant to very high temperatures and corrosion. And about smashing, a better example is a car hitting a human

But in this case we have something much heavier and much stronger than a car. Yet Mei survived without a single broken bone. It's another thing that wasn't explained in manga, but her body is also very durable. I don't care why - it simply is.
Clones argument was already covered.
So no, her body isn't resistant to corrosion or all high temperatures. That's nonsense. Even if they were, he still has Raiton, which will skewer her.
My example is completely sound, it shows that more damage is done when smashed against something. If Hiruzen smashes her against the walls of the barrier, or the ground. She will take damage. The car example doesn't even work considering if a car hits someone, they get completely run over.
Ninja are more durable than Humans are, your car example is completely irrelevant since only normal humans get injured or killed from getting run over or hit by cars.