Ooops I did it again, but can I do it another time?

Since I had already been loosing weight from my mortifying 30 year reunion experience, I was already on the right road when my daughter out of nowhere became engaged & I had 12 weeks to help her with her wedding, tailor 5 bridemaids dresses with sleeves, and all of the other motherly things one does when her daughter gets married, oh & work, it was very motivating to stay on track to look decent for the pictures. Because you know, wedding pictures are forever. Since that wedding came & went, my enthusiasm for going to the gym & restricting myself also came & went & kept on going, till low & behold, my second daughter announced she too was getting married. I have had ample time to loose weight. The only problem is much of what I have lost I keep finding it back. It is now crunch time. The wedding is a mere 6 weeks away. How much can I possibly loose in 6 weeks? Hard to say. Sometimes I feel like giving it up & throwing it all to the wind, then I see an acquaintance of mine that I have known for nearly 30 years, my same age, almost same height, wearing a cute sweater dress with boots. I want to wear a cute sweater dress & boots too! She is the busiest person in the world with a thriving medical practice, yet she has disciplined herself, exercises & eats right. Can I do it too?