Gudauri is relatively safe for a solo woman traveller, even at night. While it's always important to exercise caution and remain aware of your surroundings, this destination is generally peaceful. Violent crimes are very rare. Most locals are friendly and willing to help, and many understand basic English. The risk mainly lies in petty crimes like pickpocketing which can occur in crowded places or when you're not vigilant with your belongings, especially at night. It's also worth noting this is a popular ski resort, so it tends to be busier during the day. However, should you find yourself out after dark, stick to well-lit areas and avoid desolate paths.