So @Elephantinacravat your definition of "woman" excludes the PPs sister who was born without a womb and so therefore won't experience periods, pregnancy, breast feeding or possibly having a smear.
No, because she is still a female. She has a female body, she was born without a womb.
Humans are a bipedal species, people born with no legs are not 'not human'.
This person does not have a womb because something has happened to her
female body during her development which means that is missing. Not because she has a male reproductive system.
I don't know anything about this person and so don't want to make assumptions about her experiences. But it is possible that her female experience involves feelings around being born with a female body but not having a womb, and what that would entail: all sorts of tests, coming to terms with not having children, possible hormonal symptoms which come with not having a womb. They are her female experiences.
None of those experiences are male experiences. No man has ever been born without a womb and had to deal with the consequences of that. She is a woman.
Being born without a womb is a uniquely female experience. As is breastfeeding, childbirth etc.
In the same way that women who have hysterctomies are still women, because having a hysterectomy is a uniquely female experience.