yeah, she wanted to eat Willem so bad too.
she even cut her hair which made that last scene with Ithea crying more sad.

well at least it seemed pretty clear that those 3 likely didn't die.
just lost to the surface and assumed dead since they were all in pretty bad shape when they fell/jumped from the ship.

Think they died.
The sage said he couldnt sense Willem anymore.

Besides they probably got swarmed after that gate explosion

yeah then he walked away and they showed the water shit rippling like some tease.

i feel it was pretty heavily implied they survived and with the remaining of Chtholly's grasp on her memories she killed all the remaining Timere in the area.
Chtholly seemingly stopped Nephren from opening her gate and going all red eyed mind break.
Also Willem despite being in bad shape seemed somewhat ok.

Assuming like Ithea's case where her previous personality was lost and replaced then Chtholly is in a way dead.
Making that Loli from her dreams likely the new host of her body (since she was the child's soul Chtholly was made from right?) which could explain why the sage couldn't find Willem since that Loli wasn't some ordinary kid either.