The Dwarven Boss could ascertain his own situation the moment he saw Zhou Tian, so as an Elf with slightly higher intelligence than a dwarf, naturally, she could not be unaware of the change in her own circumstances.
It could even be said that probably when their territory was attacked from behind, that Dark Elf Boss had already become aware of part of Zhou Tian's plan. However, because she was engaged in combat with Bella at the time, she couldn't disengage and had no choice but to fight tooth and nail on the spot until she had annexed Bella's group of Elves.
Now, although the Dark Elf Boss had achieved her initial desire to successfully annex Bella's group on the Mainland, by this point, she was well aware that she was basically on a dead-end path, with virtually no chance of recovery if nothing unexpected happened.