argh i remember days/weeks like these, there rarely seems to be an answer. the best thing is probably distraction if its whinging rather than crying - going out in the pram/car, getting a new toy that will be exciting to her now she is a little older, doing a class or a fitness dvd with/next to her...
i really feel for you it can be soooooooooo wearing when little ones are just not content. i used to get really frustrated and end up sitting elijah in the bathroom in his bouncer and having a shower or taking him for really long walks just to entertain him enough to either fall asleep or cheer up for a bit!