Weight is a problem a lot of diabetics, both men and women, experience when their control gets better and the body stops starving itself.
It is very un-healthy and not advised to simply "eat less", because your body does need carbs and calories to give it energy and by eating less you're actually starving your body so when you go back to eating normally once the weight is gone, you gain it all back. That's why diets you seen advertised on tv and such, don't work. It's all about moderation, not elimination and excerise.
Instead, if you are wanting to lose the weight you've put on, the best way is to eat healthy (not necessarily less or diets), and make sure you are getting enough exercise for the amount of calories you're eating everyday. also making sure you are taking the correct amount of insulin is very important too. taking more than your body needs can cause weight gain because it can make you want to eat more.
C is a really great person to talk to about nutrition, I would suggest shooting her a message either on the public forum or as a private message to discuss how you can change your eating habits (without it being dangerous like diets), how many calories you need to take in for your age, etc etc.
Losing weight for diabetics is not always easy but it can happen in a healthy way! I've lost probably about 5pounds of the 20 i gained in a 3month period after about a month and a half of excerising and keeping a closer eye on what i'm eating (aka not cutting out all junk food, but limiting myself more than I was before).
Also remember, everyone is beautiful how they are :) you may have been smaller before starting insulin, but that may have been because your body was lacking of insulin and burning off fat and not actually healthy. If you aren't suddenly overweight or anything, I would focus on toning the weight you have, rather than trying to lose it. (turning the fat into muscle essentially, which will make you feel better)