It just seems really petty to mock on her looks. You probably wouldn't have done that if the situation involved an unattractive male relative. Gods forbid if a woman dares to be ugly...it makes the world hate her. I suspect that you used that descriptor to color your story.
I really try not to judge womens' child status based on my life choice to be a mother. There are many women (many of them here on this board) who are perfectly happy being childfree and it really bothers them that the world seems to want to blame everything about them on that childfree status. It's a very sexist attitude.