Tell her to put in a sequstering agent such as jack's magic, metal free, sequasol, anything that says it sequesters the metal. Put in as much or more than it says on the bottle. Tell her to keep the filter running as much as possible, and to add regular household bleach, a cup at a time till the chlorine measures up to 5ppms. I hope this is a pool with a filter? You should post more info.