Breast Feeding-i Am So Sick of This

My 10 month old little girl was not getting enough breast milk when she nursed and was underweight. I was only pumping 2 oz each time at the time, so we determined that I probably was not producing enough milk. I have been on fenugreek and mother's milk tea for 6 weeks now, but not a lot of improvement in output. The Dr. suggested I try giving her formula. So I did, and she was much happier and has gained over a pound in the last month. I have still been nursing in the morning and at night. There are times when she is not interested in nursing at all, but is most interested in the morning and hen I get home from work. I have a bunch of bottles in the freezer and the babysitter has been giving those as well. I just got a call from her indicating that baby has started refusing the breast milk. I guess this has happened for three days in a row now. I still have about 20 bottles in the freezer, and I really would like for her to have these. I can't believe she is rejecting breast milk. I feel rejected all over again. The big question is, how do I get these last bottles into her?