You are going to be hard pressed for a scripture that says she is wrong since she isn't wrong. I wish more people would be better prepared for evangelism before they do it. I have spent a great deal of my ministry helping people to be better prepared for it. How long did Paul wait? I think you will be surprised by the answer.
For what mortal has ever heard the voice of the living God speaking out of fire, as we have, and survived? ~ Deuteronomy 5:26
If you're not prepared to risk your very life for your "enemy" you have no right to speak to him of love. ~ Daughter
Many say they are called... but I am pretty convinced that with many of them it was the wrong number. ~ Project Peter