Breastfeeding was a priority for me. I loved it and I miss it. It's such a great feeling to be able to feed your baby. The weight came of, eventually, about a year after giving birth. I was too tired to lose weight before that.
I don't know you, but if you were my sister/friend, I would advise to focus on your baby and her health. Enjoy the miracle of life and the early months because they go by so fast. You DD doesn't care if mommy is slim. You just gave birth three months ago, don't be so hard on yourself, give yourself a break. You will lose the weight, don't worry.