Once Mira and Rhydian met up with Elenei, the latter transferred the High-Grade Spirit Stone Mine Source to Mira and then they set off to find a place where Mira can enter seclusion and complete her F.LD.I.L tests.
Luckily, Elenei can fly incredibly fast so it barely took them a few hours until they found a nice secluded cave with no signs of life in the nearby area.
Once they entered the cave, they immediately sealed off the entrance so no unwanted visitors entered the cave, though it was unlikely such a thing would happen with Rhydian and Elenei here.