Good eye! But...
As I understand, "Ms" can be used for single and married woman. "Mrs" confirms one's marital status, which is a little less preferred nowadays.
Here's what Wiktionary says:
Here's what Wiktionary says:
Ms or Ms. (plural Mss. or Mss or Mses.)
Noun
Mrs (plural Mmes)
Abbreviation
- A title used before an adult female's name or surname. Usually used with the married surname.