I don't think Harper was at all comfortable in that dress, and was gathering the fabric around her tummy/hips. Self conscious? She must feel like an elephant stood next to Victoria, even though she's a perfectly normal and lovely size.
Victoria needs to be setting that poor girl a better example. I don't like how David is around Harper at times but he seems to be the one who loves food and cooking, and I hope he shows Harper that it's actually OK to eat. Victoria's eating is horribly disordered - I have had to go lower carb due to diabetes and often eat protein with a mountain of veg and you never feel fully satiated after.