I'm not a parent so I don't know a lot about young children however I remember that when I was a young child I was scared of loud noises (balloons popping, thunder, fireworks etc.) I grew out of it over time (I am 21 now) so it is quite possible your daughter will as well. I had Audio Processing Disorder when I was a child so that could have some relationship I think. Maybe research it a little bit?

I don't really know about the whole ceiling fan/light thing. It could be just a faze or maybe a way to distract herself from noises. Good luck!