The correct answer is the second option. While Elinor does not feel secure, or safe, she maintains her self control. This means that she does not actually portray the emotions she's feeling, but instead appears fine. "Letting your guard down" signifies that you're showing emotion, which Elinor does not do. Instead, she remains composed, and keeps her guard up.
so on the positive side it could help them conmunicate but on the bad side what if your dating someone online you dont who they are good way to get kidnapped