I guess most of us are 'clinically' overweight and certainly losing the extra pounds after kids is no easy task but TBF she has been fasting two days a week for over two years which has been good for us both as I have been doing it as well.
Childbirth changes the anatomy in crazy ways, for instance she now has a dropped arch which causes other issues... And she had carpal tunnel for a time, of which she didn't complain about but I could tell it was taking it's toll and impacting sleep.
But to answer your original question, 'no', not overweight in a way that would impact a joint, just a few pounds that makes pre baby clothes an less appealing