Board Thread:Naruto Discussions/@comment-28568301-20181025153300/@comment-1512913-20181025210331

According to 4th databook, as stated above, she didn't arrive alone on Earth, but there were other Otsutsuki, most likely loyal to her, as well.

She is either ex-leader of all Otsutsuki or she was leader of the Otsutsuki on Earth, which it was, is not specified, same for her princesshoodl, if she was one before arriving on Earth, or got the title on Earth is also unknown.