If she has a ‘sister’ nobody is preventing her from using the ladies’ room. If she has a brother pretending to be a sister, he needs some mental help.
I am imagining how the family dynamics in Jackie’s family, with her great talent and rising star - and what that meant to how her parents acted - that might have been part of how her sibling went into transgender identity syndrome. Of course, the parents apparently also did not provide the sibling with sufficient professional help and support to correct the child’s mental obsession against their own body.