Kid sized saddles are not plentiful. While the above saddles are nice, they are for the most part adult sized (except for the red sprung saddle). They will do okay, and frankly kids generally adjust to about any bike irregularity.
Since OP's daughter has problems with the current saddle and there are no ready solutions, their best bet will be to go to an LBS to have her try a few. Many LBS's realize the difficulty in finding a comfortable saddle and will exchange them. Our local Performance store as well as other area stores do this. I am confident the OP will be able to find the same in their area.