Oasis

There are several things that are imposible to erase but I don't know were do they hide sometimes. When you are in a desert being very thirsty you will probably forget that deserts actually have the biggest water storage underneeth compared to other kind of soils.
This lady finds the location of water very efficiently despite her condition but sometimes some oasis turn out to be just a mirage of proper water. So she starts the journey again looking for another oasis.