Not only her - all characters in the series are motivated by urge to have sex over any healthy relationship. I'm on asperger's (autism spectrum, so limited emotions in short) and holly hell, these people act like primitive alien robots with zero emotions for me!
Author should touch some grass and actually talk with some people face to face, because this looks like as if someone sat with their hug-pillows and shampoo bottles and plotted worst drama scenario ever, and thrown their hentai/porn scenarios at it.