Nina Sosanya is most probably single at the moment. Moreover, she does not seem to have any record of dating a man in the past as well. On that basis, we can speculate that she prioritizes her profession more than starting a romantic relationship.
Besides, Nina is not active in any social site which helps her in keeping her relationship status a mystery. She might as well have dated a boyfriend in the past but she never revealed that. On top of that, we never heard any controversy about her which might qualify her as a single woman.