M.M.
You need to be blunt, you love her so yeah tell it to her straight. You don't need to feed her rainbows and sunshine about "working on her". He broke up with you because he didn't want to be with you. This was a year ago. He still does not want to be with you and never will. Stop wasting your time being emotionally tied to him when he doesn't care about you. I had to tell this to my SIL too.. luckily she figured it out before a year passed! If you need to be less blunt buy her the book "He's Just Not That Into You" it's AMAZING and my daughter will have read it before she even has her first boyfriend! Seriously, tell her to grow up, you're her SIL and you can give honest advice. Once she realizes he will never care about her or want to be with her again she'll get over it, you just have to get her to realize it's really really really really really (no matter what) over. forever. good luck!