The fabric was great, I loved it at first sight, so I didn't want her to give up on it that easy. I suggested to turn it into a tunic instead and she aproved the idea.
A few days ago, I finally took care of it (she wasn't waiting for too long though), changed the elastic on the back, and cut it from dress to tunic, hemmed and voilá! Easy peasy! And I still had a nice amount of the amazing fabric to try and turn it into something for the little princess.