system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why didn't Lord Vader sense the force in Leia during The Empire Strikes Back?
gpt
Because she hadn't awoken to her potential yet.

Think of it like a fire. Luke and Leia have a large pile of firewood and kindling. Obi-Wan had provided Luke with a spark needed to ignite that fire, and he was burning slowly until he went to Dagobah, whereupon Yoda poured a bit of kerosene on top.

Leia had never gotten so much as a spark in the original trilogy. She has great *potential*, but she's never had the training and opportunities to learn that Luke had, so her Force presence was still relatively low.