Either her or Ariel!

Maybe Jasmine or Anna.

And Ariel definitely. Anna is a maybe... Tiana would work hard for it.

Anna and Rapunzel are very similar. But so are Rapunzel and Ariel. They take action to achieve their goals, and they're both curious, adventurous, and brave.

or Ariel

By far! Anna isn't afraid to ask for help like Rapunzel, blackmailed Kristoff a bit just like Rapunzel, didn't give up in her mind what her dream was like Rapunzel, yeah.

I'd say.

The woman joined the army and defeated the previously undefeatable Huns.

Ariel definately has the most rebellious (at least against parents) out of the princesses. I disagree with all the users who said Mulan. Mulan has more respect for her parents than all the princesses so she wouldn't disobey them unless she absolutely had too.