The issue with Petra is her injuries from the tsunami. Her pelvis is key in latin dances with hip action and she lacks really good core strength which was part of the posture issues. I think that might be in part due to the tsunami also, as I had trouble working my core after spine issues. They wanted me to work them anyway to improve my spine and prevent future injury.
She reminds me a little bit of Joanna Krupa. Much better dancer than the models usually are, but she isn't as toned as people expect considering her figure.