J., I agree with Tamara. I am a NICU RN, working on my lactation certification. It seems to be the case that tyhe babies will eat more from the bottle than the breast. I would double check your pump and see if you need to tweak the settings, need a different size flange?
She could be having a growth spurt and if you were only breastfeeding, then you would feed her more often, ever 1-2 hrs if needed. The more stimulation you have to your breasts (the more milk is expressed, then the more you will produce). So I agree to try and nurse her as often as possible. If you want to power pump, then nurse your baby, then pump (just like 5-10 minutes). Do this for 2 days.
The herbs as someone stated are Fenugreek and Blessed Thistle. THe tea is similar but much weaker. You actually take 3 capsules 3 times a day of each of the the herbs and you may take them at the same time. Fenugreek is the most commonly found, you will know it is working when you smell like maple syrup. You can call any LC and they will tell you -- the breastfeeding helping where I work is ###-###-####, feel free to call with any questions. Also sometimes the moms choose to get s prescription from their OB, Reglan, made to treat gastric reflux, but the side effect is increased prolactin level. I also would recommend taking her in to see a lactaion consult. The LCs at my hospital charge insurance and if you don't have insurance they will really work with you, they really are eager to help anyone.
Let me know how it goes!
M.