Gawd. Please try adding some AI nodes. Or even just another scripted sequence that she can run to straight from there, then straight to the next one. Honestly this can be fixed with a little self-problem-solving. And motherminge, that’s true, but it’s irrelevant to his problem; he needs Alyx to reach the scripted sequence. To do that she needs a path to follow, hence nodes or a “corner” sequence to travel to/from.
Oh, and she can’t simply move to it because that drop in the floor is moor than 8 units in height, which is the max height for a “step” in the source engine. You could use nodes and hint nodes I think to make here jump down then back up if you want, but that’s a bit more complicated.