Just have her be careful not to force water under the stucco- we don't have that on our house, so I'm not sure how easy it would be to get water behind it.
We have lap siding, and I have to direct the water stream down to avoid getting it under the siding.
We do have a big problem with stucco homes and water damage in some parts of this state. The homes were mostly upper bracket (selling in the $750K and up range) and the stucco was not installed correctly.
Over the span of several years, water got behing the stucco, and rotted out the walls, and mold appeared.
Some homeowners were/are facing repair bills in excess of $100K.
The contractors are all either gone or denying responsiblity, and the insuarnce companies aren't paying up either. Icky situation.
Your friend should be okay if she's really careful.