And if she doesn't offer up other ideas, to go on, it may need some poking and prodding. It does mean that you can easily construct some false guesses and blind paths for your characters to be mistaken about, since they are happening to you; the danger of knowing the ending is that you may make it too easy for them to know what you do.
This is minor next to the problem that you really do have to figure out waht goes next. (And you will have to edit some of those false guesses out because they don't fit.) This can take a lot of thought.
So I had my hero, and his companions, ensconced somewhere safe for the moment, and I put in a scene where they eavesdrop on their elders to get some clue what was going on, which meant I needed to know myself. Gotta be done. So I buckle down to my outline. . . .
And the elders don't know, either. Much. There are a few clues they have that the younger characters don't, but not many. sigh
Did get a few notions what the evil-doers might be doing beyond the characters' guesses, but will still have to work on it.