I could've written this myself a few weeks ago. See your GP about reflux. I didn't think my DS had it, until I tried him on a thicker formula. We also tilted the mattress in his bassinette so he wasn't flat on his back. I was surprised by how much these things helped.

It could also be something you're eating that doesn't agree with her? Not sure. Definitely see your GP though, it certainly saved my sanity! I feel your pain though, and I hope things improve really quickly.