|Bowleggedness (or what looks like it) is quite normal in babies. Even disposable diapered babies have this and it's really totally normal. They outgrow it. So I wouldn't worry too much about that. Your pediatrician will know exactly what to look for and can truly diagnose any developmental issues. The bulk of cloth diapers is actually good for proper hip and leg development. It's often recommend that parents of babies with hip issues either use bulky cloth diapers or double up on disposables in order to help correct the problem.
As for bulk itself, for the most part it's a matter of perception. We believe it's uncomfortable because that's how it looks to us. Especially that we're all conditioned that only the trimmest diaper available could possibly be comfortable. I would try to objectively evaluate if she's truly having a fit because she's uncomfortable and if that's indeed the case maybe try to see if she gets used to it. It could just be that the feeling is different and it confuses her. Try putting the diaper on her and quickly picking her up and distracting her. Many babies don't like diapers changes to begin with, she could even maybe be picking up on your hesitation.
Most likely you'll get used to the bulk and soon you won't even notice it. That's how most of us feel. We're just not used to bulky diapers so it all looks so silly and uncomfortable to us. Plus as baby gets older and bigger the bulk will become much less overwhelming. Right now it's a lot of diaper and not much baby, but in a few months the diaper will be the same size but your little one will have doubled in size!
There are advantages to bulk as well. They're nice padding for when baby is learning to walk. Plus some dads actually like how small babies feel more substantial and less delicate when they're holding them.
That said, if the bulk really really bothers you and you just can't or don't want to get used to it, there are other options. The Sandy's diapers are sized so usually offer a much trimmer fit, especially in the newborn and small sizes. If your diapers are unwashed you can return them to ME for a full refund (minus shipping costs of course) and exchange them for some Sandy's. Or you could buy a few Sandy's to use until your little one is bigger and the One-Size fit better.