>sister went to a religious event
>talking on the phone with her friend about a handsome muscular guy there while shitting on the rest of the men
And the funny thing is that she is far from beautiful

women tend towards vain pursuits.
Inform her that in the Bible righteousness is more important than vanity. Show her Proverbs 31 about how to be a Noble Wife and what makes a good woman.

All women are chad only, it doesn't matter if she's virgin, religious or anything else