My coming to 21 months girl is afraid of noises. To the extend of me calling out my 7 yo boy from my room to the living room, she would just jump up and panic and cry and say she is scared. Some times when she is taking her nap , someone comes home and call for someone, she would also wake up and panic. We are quite sure that she wasnt scare by anything in her life. What can we do to help her overcome this issue ?