To be fair, if she asked him to view her as his mother, he might just be like "I'm not interested because I already have my ideal partner and because I want to view you as my mother-in-law" more than "I'm not attracted to you at all."
She kinda shot herself in the foot, really. Though, if she gave birth at 17, and the apple doesn't fall too far from the tree, I'd assume her husband went through the same shit he is going through now, which I can see how they not only got married but gave birth so young.