I can't believe I did that. Now I've really blown it. I might as well give up. You didn't choose a goal that was compelling enough for you. Sometimes we set goals because we think we should, and then wonder why we don't get what we want.
Goals take commitment.
Your goal is too big. You need to have very compelling reasons, ones that will pull you toward it. Eating in a healthy way because your doctor told you to is not very compelling. Eating in a healthy way in order to see your kids grow up is compelling. If she has already done it, make sure she has kept it.