I think she is powerful enough to help Luffy a lot. Not necesarily Luffy/Zoro/Sanji level (maybe yes), but as other users says, she fight so many times with her father, that probably she knows how to damage him (maybe because all the things she reads in the oden journal or because she fight many times with Kaido in the past). Plus, is probably that she has CoC or at least latent CoC (she dont know how to use correctly)