Eventually Wolverine and Laura found the other Transigen mutants, but even after the Reavers were defeated and Logan died, we never actually see Eden, as the movie cuts out with Laura and her friends trekking to the Canadian border.
Besides the Westchester Incident, the mutant sanctuary Eden was definitely the biggest mystery Logan didn’t fully delve into.
Regardless, unless Fox decides to green-light an X-23 spinoff, it’s doubtful we’ll ever learn the full story.
It’s possible Eden may not even exist, although since one of the young mutants was communicating over the radio with someone presumably from there, that seems unlikely.