I think my sister has real bad issues
What kind of issues are you talking about?
I think she has autism. She seems incapable of making friendship or love.
If you're concerned about your sister, you should find ways to treat her condition. It's good that you want to help her somehow.
Nah, you want me to treat her with some psychological issue. That's my sister, let her do as she pleases.
I think that just avoiding it is not going to help her at all. You should try to help her if you are so sure that she is going through problems like this.