Hello Carla. No, Colleen Wise does not fold the fabric when she discharges. Her "thing" is shadows and visual dimension and discharging is one way she uses to create them. White vinegar can be used as a stop bath (to stop the bleaching process), but it is the least effective. The best is something called Anti-chlor, but most folks don't have that around the house. It comes from dye suppliers. Even after washing out the bleach with water, it can continue to eat the fabric if you do not use something to chemically counteract the chlorine.
Yes, the avatar is a piece I made. Glad you like it. :D