Ouarzazate, often referred to as the 'doorway to the desert', is generally considered safe for solo female travelers. The locals are known for their hospitality and it has a relatively low crime rate. However, like any other place, it's always important to be aware of your surroundings, avoid isolated areas especially at night, and dress modestly respecting local customs and traditions. If you're careful and make wise decisions, it's highly likely that you'll enjoy the experience without any safety concerns.