If you want to give a female character an air of youthful femininity, give her some stuffed animals that she keeps in her room or carries around. Dolls simply won't do, it has to be stuffed animals. Anything from Teddy Bears to Plushies will help make it clear that even if this character is a woman, she's young at heart. Although that also means immature in a lot of cases. In fiction, it's often the most girlie or bratty female that still has them. In Real Life Japan, some women carry them around to try to remain Kawaiiko for fear of becoming a Christmas Cake.