She wants something less-maintenance,she is a highly active woman and also as a mother she doesn´t want to waste time with her appearance or constantly have her hair in her face.I think the ponytail suits her,but she may try variations of her hairstyle ,there are simple and quick updos that can be made in a few minutes & still look great.
I often see her in hair tied back, but it looks better than before for some reason. She seems prettier and glowing as if she fills her life with the natural fruitfulness available. The dress shines somehow and I can't get enough of the royal blue navy color it dispels. Indeed quite formidable and sort of cheating or fleeting to the eyes. Nice.