She's just leaving. Even if she jumped off she'd survive, being a non-ordinary human and all.
I was kind of disappointed in the conclusion. At first it was interesting not knowing who was in charge , and then when they turned on him, but after that it was just [Shinigami] beat [Fullbringer] each chapter. Ichigo's fight was basically "I also was a Shinigami! They're bad people!" "I don't believe you! [Wins]"
I hope this is just a small thing to establish the new character designs and find new characters beyond shinigami and hollows.
Also, Ichigo is way too OP now - he won't use the final getsuga tensho again, but he was still wildly powerful before activating that and there's no reason that's gone now. This + fullbring, what's left?