Now we can somehow agree that the Pale Tree (or any person who is in a high position and should be knowledgeable about certain events) is not really honest with us.
There are a lot of inconsistencies between what she is telling us, what is happening and what we are able to observe.
While it can be just the fault (mistakes, something overlooked etc.), this can also be by design.
As we only have limited information, this theory is actually a bit loose, but please, let me entertain you for a bit:
The attack on the summit was staged
I mentioned inconsistencies in the things she told us. However one thing she has mentioned is, that she started to raise her defences.
As I do not expect her to be stupid and that she is knowledgeable about Eldar Dragon tactics in some way, I expected her to be prepared against air and plant based attacks.
The whole Tree is her body, so I expected her at least to be a safe haven. A place where the protection is the greatest (though protecting the roots should have been the prioity maybe?)
I thought it was a bit over the top to have Mordremoth`s minion apear like an infection in the body of the Pale Tree.
If the Shadow of the Dragon would have put them down or spawned them, it would have been a different matter, but they seem to have appeaered out of nowhere in a protected area (Heavily guarded, etc…)
The Shadow of the Dragon looks like the being Sylvari Player encounter in her tutorial, which should represent Zaithan or Eldar Dargons themselves.
While we can now argue that Mordremoth created it or has access to the Dream or Nightmare to tap into that design to give it shape, I would go into the direction that The Pale Tree staged the attack
We know the Pale tree can create life , she created the Sylvari, fernhounds, etc…
What stops her from creating something imitiating the enemy to get a point across.
The World (ugh) summit clearly was not in the PCs favour from the beginning. Each leader had a way to weasle out more or less.
A common enemy that unites everyone would help to speed things up.
While we can put it down to a traitor in the own ranks, the whole szenario was just too perfect, as everyone agreed to help after it.
It was actually foreshadowed by Aerin in Episode 1, that one leader will die or be taken down. This could also be a plot.
Maybe Aerin wasn`t in control, but actually send by the Pale Tree to aquire the Power of the Zephirites.
The good and benevolent Pale Tree, only going for the greater good, despise the consequences.
However, we have not enough proof or informations at the moment, but the Idea somehow came to me.