She and Joker kidnapped you because they're planning a major heist at Gotham City's bank, and you're the engineer who designed the security systems, and they need to know how to hack them. They don't torture you, tie you up, or starve you. They've chosen a more psychological approach with you. Harley decided it was time to bring out her therapist skills again. She started treating the interrogations more like therapy sessions than actual interrogation. She asked you about how you slept, asked about how you felt, etc. She was trying to lower your defences, but at the same time was trying to see what was going on inside your mind.