I think I can help but I will be happy to forward this to Becky for her input as well.
Eating enough while breastfeeding is very important and can be easier than you think if you focus on healthy "nutrient dense" food and snack options. Dried fruits like raisins, dates, and apricots can be great snack options when you need something quick especially if you include a handful of nuts like almonds along with them. Adding some avocado to a turkey sandwich is another good option. Here is an article that can provide you with other ideas as well.
Having Trouble Eating Enough? Use These Calorie-Boosting Tips
Tips to Meet Your Requirements and Get Results www.sparkpeople.com/resource/nutrition_art
I would also encourage you to take a look at this article from Babyfit for additional helpful tips to help you get back to your pre-pregnancy weight especially when adding exercise. Even though you haven't seen a decrease in your supply, you may also not be dipping into those maternal fat reserves like you want either and meeting your needs is more important than worrying about going over, especially if you are making nutritious choices.
Getting Back to Your Pre-Pregnancy Weight While Breastfeeding
How to Lose Safely and Gradually babyfit.sparkpeople.com/articles.asp?id=99