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She tilts her her chin up and pretends to be the strong, confident woman they all believe her to be. She isn't always pretending. She usually drops the act around her family and the few close friends she has that aren't in-laws.
But she has to pretend in front of these people. She can't be the nervous, distrusting woman she usually feels like. She has to be forceful, strong, pushy to get what she wants. But the truth is, she's just tired of fighting. Tired of fighting for what should be. She just wants to lay down and let the world deal with it's own mess. But she can't. She has a duty to the people like Remus or Dobby. She has to get them the rights they deserve. Maybe then she can stop.