Where did she come from??

I hope this is explained at some point but I highly doubt it ever will be.
How was Arya able to get past all of those wight walkers? Did she wear a wight walker face magic disguise? Did Bran use the pack if ravens to air drop Arya into the circle of walkers?

And then once getting past them, how was she able to leap in the air so high that she was coming down on an angle to stab the night king?
She couldn't have jumped from the tree because it was on the other side of where she jumped.
It was already unrealistic to have her penetrate the circle of walkers undetected, but that super high and long jump puts it in an entirely different realm of retarded.

I dont care how much training she did over the course of the entire series, you cant jump like that. She has never done a jump like that. She could have used that magic jump a bunch of times during the episode and it would have saved her life.
For instance in the library room when she was trapped she could have done a flying leap on top of a bookshelf.

8 seasons of build up to the night king showdown and he was defeated by such a ridiculous method. I dont care that it was Arya who delivered the final blow, it actually makes sense now that they brought up the blue eyes thing from season 3 again. But the way she did it was utterly unbelievable and is sloppy writing that will be a sore spot on the series forever.