Stems stiff but leaves droopy, over water...stems and leaves droop, underwater.......looking at size of pot and your statement of watered 3 days ago......give her some water, they can really increase water usage as they get bigger...
As long as you attend it fairly quickly it should bounce back without much if any long term damage. Have had that happen before, going along fine then boom, all of a sudden they wanted twice as much liquids as before.