Romeo and Juliet is not a 'romantic' story. I am female and even when it was required reading in my early teens, it was 'stupid'. Sorry if it makes me unrefined to say so. When I first heard this news, I was inclined that she left without coersion, BUT partly wonder(ed) if it is along the lines of Stockholm syndrome (or as someone else mentioned, she is pregnant).
The poet Dante agrees with you. He placed the historical counterparts of Romeo and Juliet in Hell.