Body type is also a factor. I hadn't checked her weight/height ratios, only saw what people have posted here, but have always thought she looked a little on the heavy side, BUT she is short-bodied (or waisted, for those of you who know what that refers to), thickier though the middle, so she is bound to look heavier than a woman of comparable height/weight who has a longer body so the weight is more evenly distributed.
The use of the word "fat" is totally overplayed these days, imo. You have someone average size especially women, and you have morons unjustly calling them "fat". Totally overused word. There are players both male and female who could stand to lose a couple of kilos to improve their movement and overall play, but no players on the tour are truly "fat" in the correct definition of the word, and certainly not obese.