I know that she's new as a Governess and probably wants to impress the Collins family and have them think that she knows what she's doing and that she can handle things on her own, but running out into the woods at 3AM in the morning to look for David, and then getting ready to run out again at 5AM (before Barnabas bought him home) is just downright crazy! And lets not forget that there still is an "animal" loose out there somewhere.
You wouldn't catch me doing that! Go and wake up his father for goodness sakes, or better yet, call the cops!