Oh, I'm sorry! For some reason itch.io flagged this as spam but didn't actually bother telling me, I only found it because I was poking around the deeper tabs of my analytics
Once you've gained the quest, one of the Hab rooms - Selene tells you to go there, but has forgotten which one - contains a mass of hive-flesh with her case embedded in it. It puts you in a little gathering minigame to retrieve it. You then bring it back.