Ponta Grossa is moderately safe for solo female travelers. Crime rates are less compared to many other major cities in Brazil. However, it's important to remain vigilant, avoiding areas of known danger, not exhibiting flashy items, and not walking alone at night. Though hailing taxis directly off the street is generally safe, it is recommended to use a reliable taxi service or Uber for maximum safety. As with any travel, it's advisable to keep friends or family members informed of your daily itinerary.