The thing with Cosimar is that nobody seems to have put a brain cell worth of thought into her condition. She doesn't *need* to resurrect into a new body. *Her powers* twisted her body, and it's *her powers* that can 'twist it back' to how she would prefer to look, the same as Proteus uses his reality-warping powers to turn his current body into a glowing purple Ken doll, when it definitely doesn't start out that way.
She doesn't need to die and come back in a new body, which her untrained powers may well warp and twist all over again, she *needs training.*
Her own powers are what caused this, and it's her own powers that can fix it. And someone like Proteus, with similar powers, and manifestly able to do exactly the thing she wants done, is exactly who she needs to show her.
She doesn't need 'the Five,' she only needs one of them...
Her seeking out a Crucible *is* the wrong choice, but not for the reason Dani says.