That's just the thing though. What she saw in the first vision is maybe at least ten seconds. Her portents let her see the first thirty seconds; there's still so much more she could see and know if she acts on the next twenty seconds. Things like would it attack or run away if Owldin hits it with a Shocking Grasp. Would it respond to Sonia if she spoke to it with Tongues.

And again, even though she technically did see some of the first vision, as you wrote, it's only because Lotte did something apparently before Sonia's Portent was done, as in before she actually knew what would happen. I get it, it's also because KoL posted before me, but even then that just meant that Sonia's Portent didn't happen; Owldin never got orders from Sonia to tie a rope around the creature, which now can't happen because Lotte got the creature out of the water instead of Owldin.