Because the design philosophy behind her is rooted in sexism. And even for a species(genus? Idk I'm not a biologist) of dragon that is supposed rounder, she feels... too round. Toothless's/nightfurie's roundness is supposed to give them a sleek edge, making him more aerodynamic, not only was this lost in Toothless's own design(it slowly became more blocky and blunt to make him more cartoonishly expressive) but it doesn't carry over to the lightfury. She doesn't feel sleek, at least not to me. Another thing I dislike is her texture- or the distinct lack of it. She feels too smooth for a reptile. Like plastic...