Turns out the Eliza from Treasures of ECHO Madre is really Pickle’s sister, but he doesn’t think she’ll last long by herself. Go to the nearby Travel Fast station and teleport to Triton Flats. Leave the station and close by will be a Badass Shugguruth, so kill it and pick up the ECHO it drops.

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The Badass Shuggurath is right outside the Fast Travel station in Triton Flats and drops the ECHO needed to continue.

After listening to it, go to Lunar Junction and find Abbot near the Zoomy station. Slap him when prompted, then do it again to get the tracking info needed to find Eliza. Grab a vehicle and head to the next location, where you’ll find a bunch of Orphan Rathyds attacking the vehicle. DO NOT KILL them, as it’s an optional objective.

Grab the ECHO and listen to it to find out Eliza is still alive, likely hiding out in Crisis Scar. Fight through the Scavs and you’ll eventually find Eliza inside a building. She wants you to fight off three rounds of enemies while she gets into the jet and helps out.

These waves consists of Outlaws, Lunatics and Scavs, with the third wave having Bruce, who is pretty much a Badass Outlaw. Kill every single one of them, then report back to Pickle to finish the mission.