1)The glimmer of white occurred after she had been freaking herself out. This should fit with your understanding.
2) She did two things and is now reflecting back on them: She went into a house, and she explored a graveyard. The exploring of the graveyard occurred after the activity in the house had occurred. That explains the first sentence in 2. The second sentence in 2 signifies two situations in the past - visiting the graveyard, and reflecting on it. The graveyard episode occurred first.
Student or Learner