I use estes marine sand and never had any problems with it, i only clean the surface of it, i don´t stir the sand with my python, just recolect dirt from the surface of the sand, and then stir the sand to prevent anaerobic bacteria.
She must have quite a few in there if she is taking her time over them.
Good luck,
Alex
P.S Sorry to change the subject, but Brents rays are over due by over three/four weeks.