My English teacher advocated a list of synonyms for belonging - you should formulate one. For your specific case, a "sense of inclusion" could work as a simple substitution. If you want to be more grandiose, try (if it's for a girl): "she had an innate feeling, that swept through every vein and every cell in her body, that told her only one thing: there indeed was a perfect place for her to be at the point in time - her place was here, the time was now".