So the question is: does a gal become a Mrs after she gets married, or does she stay a Ms? Traditionally, women will become a Mrs upon getting married. On the other hand, Ms is intended to be more ambiguous: it can refer to a married or unmarried woman.
That said, some women opt to not be referred to as Mrs, even after they get married. So while there is a difference between Ms vs Mrs, both can in fact be acceptable prefixes to use for married women!
Ms vs Mrs – Do You Become a Mrs After Getting Married?