Affiliate Marketing Secrets

My friend is having a problem with an employee at a salon he manages with his mom. They hired a manicurist and she began handing out pamphlets to customers about Christianity. Because we live in a very culturally mixed area they received complaints immediately. They talked to her about the pamphlets and she stopped moving to conversations during the treatments. A very generous as well as nice Hindu woman and another employee state that her conversations are:
“Doing anything this weekend”
-Client says they are not Christian or do not believe in God.
“Well, You should come to my church. I have really turned my life around being in the light of Christ”
-Client declines.
“You have a very beautiful (son/daughter/ young relative) I would hate to see the in Heaven without you by their side.
or
“Do you know exactly what would happen if you died to today, I do and I want to share the truth with you.”
After that she stops.
They have issued verbal and written reprimands but she continued to persist. Finally they told he she would be terminated the next time she converses to a client about religion. The next shift she came in a handed my friend a letter from a lawyer from her local church who is also affiliated with the Alliance Defense Fund. The letter states that her belief as a Evangelical Christian is to share with others Jesus Christ and if the fire her it would be a violation of her civil rights to religion and free speech. Can my friend fire the woman?