Woll explained that Jessica is currently struggling to come to terms with her status as a vampire.
"Jess and I got to do a lot of fun stuff," she told Blastr. "Very active and dramatic. It suits a growing teen. I love going on her adventures.
"'Am I human? Am I vampire? Girl or woman? Dominant or subordinate? Can I be everything at once or do I have to choose?' It's a confusing time for Jessica."
Woll added that playing Jessica is a "dream", saying: "I love that I never have to play the same scene twice. She is always evolving and never boring. She also represents some of the core hardships of being different in a homogenised world. I like being able to tell that story."
Woll also revealed that the fourth season of True Blood will be more expansive than previous episodes.
"True Blood has always been dark, but it's also been contained to Bon Temps or the south," she said. "The events of this season are much more political and could have national, if not global, importance in the True Blood world. You can no longer hide from our darkness. We are coming to get you."
Woll's co-star Chris Bauer has previously promised that the fourth season has some "great twists", while Lauren Bowles described it as "just insanity".
True Blood continues on Sundays at 9pm on HBO.
Watch Jessica's latest video blog (contains strong language) below: