User blog comment:Nerdyanimegirl225/The Worst. The Best, and why?/@comment-24748439-20140525134406/@comment-7418318-20140525200403

Since you didn't dispute my other point, does that mean you agree?

As for Urano Metria: When she was still fresh, there was no need to cast it... that's assuming she was already recovered from what Jackal did to her. Against Franmalth it would most likely haven't worked, due to his ability to absorb magic. And after that, she was too drained to even think about using it.

In short we can't tell if she can or can not cast it unsupported, but personally I believe she can.