tuđinka

1. stranger; outsider
   Osećala se kao tuđinka u sopstvenoj porodici. — She felt like a stranger in her own family.
2. formal foreigner; alien
   U tom selu je dugo bila tuđinka. — In that village she was long seen as a foreigner.

In everyday speech strankinja is more usual for a foreign woman; tuđinka stresses being an outsider.