After Mira announced such a generous reward to her two companions, they began trying to come up with some sort of plan. The keyword here is 'trying'. The three of them didn't actually know anything about Natural Formations. They didn't even know much about normal Formations!
Elenei came out of her shock and watched as the idiot trio kept coming up with ideas to get out of this place and realized that they knew nothing about Natural Formations, much less one that has illusion and spatial elements to it!
She couldn't understand why Mira would even guess such a thing. It was almost like…
Elenei just thought of something that left her a bit unsettled, but she was sure that her speculation wasn't too far off. Someone or something was watching them from afar and provided Mira with the necessary information.
