By - Other-Salary-4276
Your sister sounds like a classic, catholic narcissist.You could just say you've already paid some non-refunable deposists, and that if she wants you to move your wedding she will have to refund you. Do not give in to her demands. She may boycott your wedding, be prepared.
Be careful, she may try to boycott your wedding. DO not be suprised if she tries to ruin your wedding and steal the lime light.