...
I think it is understandable that Harry forgot with the state he is in.
Perhaps; but can she be sure of his state?
Lara, after all: was
also present!
So she knows that Harry knows,
somewhere inside.
As he "comes back to himself," she must realize that Harry's going to recognize that she has been "playing dumb" (if that's what was going on).
(of course, now that Harry has "turned the tables," that may not matter so much)