it's a er.. female between девочка and женщина. I think closest by meaning would be maiden or miss or fraulein
btw "Молодая девушкa" is an tautologism - "девушка" always means 'молодая'. Using phrases like this could cost you a high grade in school work like composition.
so it's девочка >> девушкa >> женщина? Maybe something similar to Spanish: niña, chica and mujer.