FWIW, Here is my story. The only thing we have in common is T1D. I am male (so never pregnant) and I have never had a real significant weight problem. My one and only child hasn't been 6 for 29 years, and she is out of the house. My highest was 185 lbs and I wasn't fat, but didn't like the way I looked or felt. My 3-step plan has me down to 160 lbs, my energy level is up and I am using less insulin than ever. (BTW, It took two years!)
For me at least, carbs don't matter (pizza and white rice does)! The most important thing to realize is that diets won't work, but changing your eating and exercise habits will.
1 - Portion Size! Pay very close attention to how much you are eating at any one meal. Ease your way into eating smaller quantities. My sandwiches always had at least 4 slices of meat and 3 - 4 slices of cheese on them. I now have 2 slices of meat and 1 - 2 slices of cheese. Plus, I have loaded them up with lettuce, cucumber, sprouts, bell pepper slices, tomatoes, etc., depending on what's in season.
2 - Time-shift your Calories! Move your biggest meal to an earlier part of the day. IOW, don't eat a big dinner, go to bed and expect to lose weight. Another alternative is to have smaller and more frequent meals.
3 - Exercise, Exercise, Exercise! Exercise makes your body burn calories more efficiently, plus it can lower your Total Daily Insulin Dose (TDD) and make you more sensitive to insulin. Zumba is good, but not enough! Yoga and a muscle toning program like Body Pump are also important.
For recipes, there are a lot of good recipes on-line @ cooks.com, foodnetwork.com and allrecipes.com. I actually just type things into google like "chicken scaloppini" and adapt the recipes to what I have on hand.
Remember that you didn't put on extra weight all at once, and it won't come off all at once. Focus more on the steps above, throw away your scales and the weight will come off for NEXT summer and all the summers after that!
You can do it!