Gayle,

You could contact Photobrasive and they would likely create the resists for you. They would send them to you on silicone release paper so that you could peel them off and apply.

I would order some extra, as there is a learning curve to getting them applied squarely and without damage.

Hi Gayle,
This is another idea. Up until recently I often sandblasted glass. I used cheap sign vinyl. I cut it with my plotter and make my own stencil. Picked out the parts that would be blasted, applied, taped off, blasted and threw in the sink. The mask and tape would just peel off. Very cheap way to do this. Unless she is looking for very detailed images. I used to do beer steins, James line 1 Best man line 2, date line 3. Time consuming but cheap.

They say you can use contact paper too. I am not good enough with a xacto blade for that.

Good Luck.