Bang's comment from Redon actually implies that O-Lin probably isn't coming back this way. He used the gag in the early 930's and explicitly showed BM falling in the water there.
Here he doesn't even show the water, which implies something else likely happens to her (either she lands on Wano's mainland or on her ship). Its a great moment to bring back her ship anyhow.
Its a good sign, not a bad one.