With my two boys I actually made too much milk and my consultant had me one side feed for several feedings and that diminished my supply a lot. It went too far down and I had to find a way to get it back. Like the others said, the high end pump works great. If you can get ahold of a hospital grade one to rent I suggest it. Also the herb "fenugreek" worked wonderfully for me and several friends of mine. It's widely used and been proven safe for breastfeeding. In fast it's almost exclusively taken by mothers trying to increase there supply. Another herb is some kind of marshmellow root or something of the sort. Ask your consultant about it.
Has your baby been gaining proper weight? That would show if the baby just isn't latching on right in order to stimulate. They can still get a bit of milk but it won't be the right stimulation for your supply.
Also, let her use you as a pacifier, that will get in some extra stimulation you make be lacking.