Sensory issues - noise and light

My teenage daughter is awaiting diagnosis of ASD due to a number of different issues.

But one of the problems she has is that she can hear any tiny noise, even noises other people cannot hear, and hates bright light.  

The noise issue is the hardest one to help her with as it is small noises that she can hear, so I try to be as quiet as I can and not rattle things or make unneccessary noises, but sometimes small sounds just can't be avoided, like my joints cracking or the sound of a page turning, or a pen on paper.  It's impossible to be totally silent.

She does play music or watch tv quite loudly and even likes subtitles on so as not to miss a thing.

She goes to senior school and has to deal with the noises there which she does find overwhelming and so comes home tired and irritable.

I do understand that hearing these noises causes her distress and I wondered how other people who have such sensitive hearing are dealing with this?