You might want to try a different pump, too... I obviously haven't BFd yet, but I've been reading a LOT of reviews on pumps and it seems common that some pumps work for some women, and not for others - something to do with the different cups, types of suction, strength of suction, etc.
Try to avoid Avent pumps though, apparently the motors break down in them easily and they leak everywhere - at least, that's what I've heard.
Of course everyone raves about Medela pumps, but they're on the pricey end of things so it all depends. Maybe try renting one from the hospital and see if you can find one that works for you? That way you won't commit to buying one and have it not work out, that can get expensive!
The other thing I've read is like Celry said, it's perfectly normal to get less BM from pumping than from BFing because babies are just more efficient at getting the BM out.
Something else I've read is that BF is much like everything else related to pregnancy & childbirth, in that your thoughts become reality. They say that worrying about low supply can actually cause low supply problems, something to do with cortisol (the stress hormone) interfering with prolactin (the milk hormone). So maybe like Celry said, try reading a book or focusing on something other than pumping, it might help.
In any case, that's all completely anecdotal as I have no real world BFing experience yet LOL - but I've done a lot of homework, being determined to EBF for at least 6 months, so it might be helpful.
Good luck, and welcome back - your little girl is beautiful!