That's a metal skeleton, and unless it's detached at the BOLT in the center, you have a broken frame. TPE has a very low melting point, so welding is out of the question, but JB Weld might work. If successfully fixed, she will have significant scarring. So, you want to make as clean a cut as possible so the scar is not too ghastly. I'd go in from the back. If a reasonably stout fix that can withstand your requirements cannot be obtained, I'd say it's time for another body. Good luck!