You have no control of this I'm sorry. It's up to your sister to decide what she does. you can feel happy or terrible at her decisions but you do not control them. Some things we do, some we don't. Continue your support of her and your love. This counts a lot. But your dream may not be her dream or reality. A sister is so important to us, but we have little control of them or them us. I did not like some of my sister's life choices but I control hers as little as she controls mine. When I married 31 years ago, my loving brother told me he gave my marriage 6 months. He's dead now, but DH had withstood kids, money problems and MS. 31 years!!!!!