I can't be sure, perhaps no one ever will be) but I just feel that she had a real disease, or had a dreaded certainty that she would get what her father had perhaps died from, like cancer. The physical symptoms describe what many cancer or similarly terminal patients feel (depending on the disease or variant).

Maybe I'm wrong, but regardless I don't feel that it was about a pregnancy or abortion; it just does not connect with the phase 'womb never filled'. It sounds like she was bereft of fearing a future (death??) never having married or perhaps was jilted, never having found a faithful love.

Yes, it's a reach, but that's the feeling I got every time I did it.