The Other Woman by Sandie Jones 

Emily thinks Adam’s perfect; the man she thought she’d never meet. But lurking in the shadows is a rival; a woman who shares a deep bond with the man she loves. Emily chose Adam, but she didn’t choose his mother Pammie. There’s nothing a mother wouldn’t do for her son, and now Emily is about to find out just how far Pammie will go to get what she wants: Emily gone forever.