Your daughter doesn’t really need to break anything, at first, unless that’s the first opportunity she has. She needs to have a very strong kick to the nether regions combined with an eye gouge and throat punch. Then break whatever you can if that doesn’t stop an assailant. My daughter is a second degree black belt. She a formidable opponent for sure!
My daughter is the smallest student in her class, most classmates are at least half a head taller, several more than a head. I had her in karate but determined she lacks the body structure for strong kicks & punches. She needs to maximize her attack surprise which in unrestricted Ju Jitsu is breaking something.
Would your daughter be able to counter this attack once surprised and on the ground: https://web.archive.org/web/20220502172954im_/https://conservativeus.com/wp-content/uploads/2022/05/bully-surprised1.mp4