She enthralled the audience, she overcame Paul's Spell Eater (aka the best one extant), she warps reality and OL just got done telling the president that the only place that she was reliably containable was TARTARUS.
The chains stop magic, you have to have magic working on her to break the curse; you can't break it without removing the chains which gives her back her reality altering powers. It's simple causality.
Take chain off; she can affect the world again with her reality warping powers and her only weakness is the Lasso of Truth. Why don't you actually go READ her character page. Pay special attention to her Powers and Weaknesses section.
Tsaritsa (New Earth)
You have to take the chains off to break the curse. Which is very STUPID. (Unless you're in a place where here powers don't work; like ... Tartarus.)