Maybe...but her face and arms were plump too in book 1 and in later shots. We didn't see Leetah plump up in anywhere but her tummy when she was carrying the twins.
When I was looking through book 2 the other day, I actually saw several more shots of sun villagers who were plump, though not as much as the baker. It was only starting in book 5 on that the sun villagers discovered dieting. That was around the time Mender was born and came into his powers...maybe he discovered how to do elven liposuction.