system
Given the following post, respond as if you're commenting on Reddit:
human
[Thor Ragnarok] Why didn't Hela take the space stone?
gpt
Take it? She had it. Asgard was hers, so as far as she was concerned the Tesseract was in her hip pocket. She just didn't have an immediate use for it since she was still "cleaning house" and wasn't expecting Thor and Loki to scuttle Asgard by reviving Surtur. She might have made a nice glaive out of it when she was ready to go conquer more planets. Or maybe another hammer, just for fun... Anyone else might have become obsessed with it on sight, but Hela's power level is so high it was just a "good get" for her.

Edit: If she *had* siezed the Tesseract immediately she might have been able to defeat Surtur or escape Asgard without being destroyed or left powerless, but she saw her dominion as a foregone conclusion. She just underestimated her brothers and carelessly left herself vulnerable.