Well it was revealed she wasn't really thirsty, she's just practicing her acting because it's the only way she can right now. She was going to play as the princess at the Golden Saucer, "My Hero" and all her lines are very standard princess in trouble stuff.
Maybe Wedge should have been less subtle with that reveal.
That sounds reasonable.
Jessie's acting to alleviate the stress of the constant threat of death.