We don't know too much about Rastha, but I'm guessing that all she genuinely wanted was freedom and power, two things she has never possessed in her life. Now that she has an inkling of it, it's like it all gets to her head and she becomes way too thoughtless and impulsive in her decisions. However, in her defense, I will say that her number one priority appears to be survival. She doesn't want to be a slave again. She doesn't want her old life. So she'll do whatever it takes. It sucks this man is blackmailing her like this. Psychologically, it won't go well for Rashta. She's going to grow more and more paranoid I bet. I still don't like her and I wish she had more complexity to her, because there's absolutely room for backstory and growth here that could turn her into an interesting character.
Thank you for the update!