Have you got a baby sling/carrier? I used to wear my DS in a Baby Bjorn just so he would get some sleep. Otherwise does she sleep well in a pram? Maybe you could go for a walk around the block to get her off to sleep?

Another thing you could try is Brauer Colic Relief, it is all natural and you can buy it at chemists. I used to find it helped relax my DS when I didn't know what else to do.

I know the frustration well! Good luck.