If you have plenty of extra money get anything you want.
For losing weight there is only one specific thing you will have to do, no getting around it. Take in less calories than you need for maintain your weight.
As you lose you that amount will change also but will still have to be less. The more of a calorie deficit you have the faster you lose.
I do not follow any of those fad diets and consider most of them a racket or scam, most them a waste of money and time, but each to their own.
If you are wanting to change for your daughters sake it may be harder to do... but then again it may be eaiser. Any motivation helps to get going on weight loss. If you do it intelligently by eating the healthy foods you like, by not overly restricting yourself, (which would cause a backlash within you against being deprived and causing you to give up) by cutting out or way down on high calorie "junk" types of food or cutting them out, by doing some exercise which you enjoy (walking around the lake, bicycle rides.. whatever YOU like) etc you can lose and have a healthy lifestyle which you can keep doing forever. I see so many people jump into some fad type stuff, most give up early, others get it off... Then gain it all back shortly because they did it the fad way and did not learn how to eat correctly for life.
A VERY good friend of mine did exactly that, she had such will power following that diet. And she dropped the weight. Over a hundred lbs. I hate saying I knew what was going to happen when she got that off... and watched her put it all back on in six months. Plus she said she would never bother losing it again. I HATED THAT.
If you want that weight off and most important, kept off, you will have to change your way of living to an extent to accommodate that. It should be done by eating foods you like or love and eating less of them. Plus exercise.
Very good luck and happy new years to you
B F R