I think you need to keep her life as secure and predictable as possible with as many regular pleasing rituals as possible. She needs to know love and feel loved by both her mommy and her daddy. As to the noises, I would continue to acknowledge her fears( I see you're scared right now of xxx) and subtly change the focus of her attention to something else that she finds pleasurable. From time to time I would ask her(not when she's hearing a scary noise) what is so scary to her about the noise that xxx makes. I would also take one of her favorite dollies and role-play with her,saying, "You be the dolly and I'll be you." In the course of acting out a story ask her (i.e. Her dolly) what noises make her scary, offering up some examples of what noises make you (i.e. your daughter) scary. Get the idea?
She, and perhaps you, are quite fragile emotionally right now. Manifestations of that discomforting state can take on seemingly unrelated expressions. I know you'll abide with your little girl and see her through this. Who is taking care of and supporting you? You need to be supported if you expect to be your supportive best for your daughter. Good luck.