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Yes, if she has witnessed such life threatening trauma in her young age, she might act weird sometimes. But that does not mean that she has any psychiatric illness.
You should focus on your relationship with her and give her proper time and she will come out of her psychological trauma. But symptoms like hearing things which others cannot hear, or talking to her mom, fear, etc., should be evaluated by a psychiatrist. This could be due to excessive stress or some psychotic issue. This should be ruled out.