Maybe it is around that value. Several interviews have her at 1,72m but having either 1+ or -1 is probably up to posture during the measurement. Every time i renew my ID my height always different, although i haven't been growing (up) for more than a decade
And although i reckon it's a low height for a model, my favorite of several years ago (Laetitia Casta) was even a bit lower. It's the size that matters. It's what you do with it