Weight loss advice

Trying to get some advice. My wife and i have gone to a fertility doc after TTC for 2 years. Doc ran all the tests on her, she has Pcos, but has been able to ovulate normally for 2 months following 4 months of treatment and still nothing. I got tested, my count is high and they look good. Doc said Weight loss. Her BMI is 4 points too high and the doc said loose 40 lbs and keep it off for 3 months then we'll look into <a href="https://glowing.com/glow-fertility-program">IVF</a>.

Now to the point of the story.... She spent the month in Florida with our twin 5 yr olds, going to theme parks and walking around continuously, on top of no more soda, and eating healthier. She is extremely discouraged, what can i do to help. She already gets upset that I stopped drinking soda and lost a bunch of weight. I've tried to get her out and about before thier trip. And i cleaned out and setup the basement with a treadmill (that i've been using and have gone down a pant size already)

Thanks in advance