I'm going to pretty much ruin my sister's dream and imply she's ugly because I don't want her to turn down a more viable opportunity.
What's her dream?
I'm not going to explain it to you, but she should know better.
You don't have to like her or her goals. But they're hers and her life, so don't get in the way and sabotage your sister.
No, I think she's making a huge mistake.
It is really bad to ruin your sister's dreams. That is something that can damage your relationship forever so you shouldn't do it.