If it is fairly fresh scrub it with a white scotchbrite pad and a diluted mixture of vinegar and water. The acid in the vinegar should take up the haze if it isn't cured completely yet. Sound like you have haze and footprints on the surface of the tile where she walked. If the vinegar doesn't work an epoxy haze remover is in order. As for the grout line you can cut it out if it needs regrouted but epoxy is a pain to remove.