Sospel is generally very safe for solo female travelers. It's a small, friendly town in the French Riviera region, known for its medieval architecture and calm, peaceful atmosphere. Like most places in France, locals are used to tourists and are often willing to help. While it's always important to exercise your usual caution, violent crime is particularly low and it's generally safe to walk around even at night. Of course, as always, stay alert and be aware of your surroundings, particularly in more isolated areas or at night.