you can call her by her first name or call her Miss Then her last name ( example Miss Stein ) Miss means young
In most cases, if you know that a woman is married you would call her Mrs., and if you do not know whether she is married, or if you know that she is not married, you would call her Ms. Also, it is polite to address people as they wish to be addressed, so even a married woman could be addressed as Ms. if that is how she wishes to be known.
Mrs. is a title of respect that may be used to address a married woman. Ms. is preferable, especially if you do not know what the woman's preferred title is, or if you do not know the marital status of the woman.
Unless the woman specifies otherwise, always address correspondence to Ms.
You address a woman as Mrs. when you know she is married. When you know she is single you address her as Miss. When you are uncertain about her marital status it is best to address her as Ms.
You can address an unmarried woman as "Ms." just as well as a married woman. In a situation where you are unsure of the marital status, "Ms." is a safe form of address, and avoid "Miss" and "Mrs."
A respectful way of addressing a woman is to call her Ms. or Miss. This is polite even when you do not know if she is married.
Call her ma'am. If written, Ms. Jane Doe is acceptable.
You can address them as 'Sir' if they are a man, ' Miss' if you do not know if the lady is married or not, 'Madam' if you know the lady is married. If you are writing a letter, and you do not know the gender, you can address him/her as 'Dear Sir/Madam'. If you do not want to use any of the above, you may use 'excuse me'. Hope this answers your question :)
If you are unaware whether a woman is married or not, use Ms. If it is a man, obviously, Mr. is used in all cases. so Ms. for a woman, and Mr. for a man.
Mrs. is when a women is married. Ms. is when they are not married. Miss is when thay are younger.
When you don't know about the marital status of a French woman, you can write to her "madame". She won't be offended. Anyway there is no real equivalent to 'Ms' in French.
Unfortauntely, we don't know the address of your land lady. However, If you're trying to address a letter to your land lady you'd just address her as Ms. or Mrs. depending on if she married or not.