Queenie has to be pretty close in age to Tina, i.e. a year or two at most. When Tina heads off to Ilvermorny she would have had to leave her sister behind... meaning Queenie would be on her own for years if she was very young -- and this would be against the law and the No-Maj authorities would be involved.
Either Queenie is a twin to Tina and they went off together, Tina was allowed to bring Queenie along, or Queenie is a year (maybe two?) younger at most.--HarryPotterRules1 (talk) 18:01, November 18, 2016 (UTC)