Collar her.

You could easily kill her and make an example. But no, that'd be easy, and The Disciples would expect that. You need to do something else. To really drive the point home.

An idea crosses your mind. You take one of the shock collars that you use to keep the Traders in line. It's time for Nisha to learn there's more in life than "Kill or be killed."

You slip the collar on her, and get some chains. Let the fun begin.