Do you think a woman is still a "Mrs." if she get divorced or Widowed?

If a lady wishes to be addressed as "Mrs" then I'm going to honor her wishes.

If I don't know what honorific a lady prefers, I use "Ms." But if she asks me to use "Mrs" or "Miss" instead, I'll try to do that. 

If she changed her surname upon marriage and keeps that name after being divorced or widowed she'd still be "Mrs. Whatever". If she never changed her name she was never a Mrs. (but rather a "Ms.") she would remain so after leaving or losing a spouse. 

If that's what she wants to call  herself, that's what she is ! ! !

No I don't "think" it. I know that a woman is a "Mrs" if she CHOOSES to be. Even if "she get divorced or widowed"

yes. It's their own preference to use it as they wish.

in school, we had a Mrs 'Smith' (it was quite a unique name, so I wont use it here)

it was only many years later at a school reunion that someone told me she was 'a single lady by choice' (implication being that she was more interested in other ladies than men).

she chose to be 'Mrs' and everyone - other faculty and staff - all respected that

Whatever she wants.

I think we should be allowed to identify ourselves in whatever way that we choose.

If I want to call myself "Lord Grimbul Fneebletwonk, supreme overlord of the 9th dimension" then I can do that... and live with the fact that some people might think my name is a bit silly.

If any woman wants to be "Mrs" whatever, that is probably a lot less silly. It's her choice, that's the way I see it.

Here, in the 21st century, I don't regard old traditions of nomenclature to be very relevant. Times change, and it is a good thing that they do.