Why would an extroverted woman still be single in her 40s and never married?

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This is regarding my cousin who is 44 never been married although she was almost married but the guy broke up with her. She texts about dating 24/7 and she has been chasing a guy for 4 years but he isn’t interested I just don’t know how she doesn’t see this as he has never took her on a date and has told her numerous times he sees as her sister.

She is a bit overweight and doesn’t dress well. She lives in another country and I don’t know what she’s really like as I’ve only met her a few times.
Why would an extroverted woman still be single in her 40s and never married?
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