Whereas, on the other hand, Sierra had fully recovered from her injuries. The shock and the people never contacted her again, and she was grateful for that.
Until this time, she had no clue if they did, how she was going to handle the different things. Just a single incident and her memory were already filled with the trauma to undergo. However, for her children, Sierra knew perfectly that she needed to act as if nothing had happened. Otherwise, her children will be super alarmed and raise questions that would hardly be answered.
To avoid raising suspicions, Sierra had tried to maintain her regular life as per her day. Yet she had avoided going out from her own home, in the thought maybe danger was lingering around. Finding herself in the grave situation again and knowing that Charles can't save her was distressful.