Honestly it sounds like she gave u the daddy role. Now with a lot of about girls who find a daddy there's usually a strong sexual attraction quite hard for them to ignore. However u said that her past bf's were only interested in the role play. So despite the fact that she thinks she's kinky she doesn't feel like she should engage in sex. Daddy should. In the community Daddys are stern but loving. Next time u want sex from her play into her fetish needs. Tell her what daddy wants her to do. And start off with simple things leading up to sex. Every time she does what u want tell her good girl. Make her give daddy a hug. Then tell her to let daddy check if she's wet. (Depending on ur ick factor) put ur hands in her diaper and see if she is and if she is massage her clit. Then stop and tell her she's a naughty girl nd needs to be punished. Then punish her. It might suck if ur not into it but it sounds like sense she sees u as daddy u have to bring the sexuality back into the fetish for her. Wen she's soaked give her diaper rubs the works