ASTRAYRKA

What tree? The only tree nearby was in front of the night king, if I recall, and Arya came up from behind him.

They were literally surrounded by trees. They were in the Godswood, on the edge of the clearing

Wasn’t the night King nearing the center of the clearing to kill bran? As in, away from the trees at the edge of the clearing?
Even then, the tree that she jumped from would be visible in the shot that has her falling on the guy, screaming to get rid of that pesky element of surprise assassins use.

The screaming was to distract him and make it look like she is a shitty assassin, however she planned the bottom hand - look at all her training, she always goes for the stomach.