For all practical purposes we can know where a person stands regarding their lifestyle.
But I don't think this verse gives us a license to make judgments on the ultimate salvation or condemnation of others based on the severity of their sin.
sin - we are all sinners - no such thing as severity of sin with God - sin is sin. BUT Christians do not choose a sinful lifestyle, and then, DEFEND IT!
She can do whatever she wants - and I DID NOT condemn her - she is condemning herself.
However, God tells us "you will know them by their fruits." And I stand on that. I never said anything about ultimate salvation - what she does in the future is up to her - another choice of her's.
When Christians (those that follow the Lord and does HIS WILL and not what we choose) - sin, they know it, the HOLY SPIRIT convicts them and they repent. She enjoys her sinful lifestyle. Big difference. She is not living a Christian lifestyle.
If you don't get that, you don't get it. That's all.
But I will point out in case there are non-Christians reading and think that her lifestyle is acceptable to God. It is not. She can pray and read the bible all she wants, that does not make a person a Christian.