since your baby has just started other foods, it is natural that she will want to nurse less. however, since you want her to have breastmilk too in more quantity than she has now, i would suggest you add it to other foods.
i used to add breastmilk to her purees, mashed foods, rice, absolutely anything almost while we were introducing her to new foods. it helped her get her dose of breastmilk and also made it easier for her to try new foods as she found a similar taste because of the breastmilk. also, if your doctor is fine with her weight gain, i think you don't need to worry so much :)
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