Honestly, I really do understand your frustration, but just carry on with what you are doing and she will come to you, but it will take time to gain her trust. It was a little blip with the cat litter tray tonight (bet you had a few choice words for the cat :lol
but then your bun needs to hear and get used to household sounds anyway.
I took on last December an extremely traumatised bun who had spent 5 months hid in the darkest corner of his hutch, refusing to eat in front of people, wouldn't take food from anyone, hated even to be looked at let alone be touched, but after about 2 weeks he started to investigate me, and accept little treats, but you just have to accept that it is going to take some time, and I always think in such situations, expect nothing, and just take each day at a time, with no demands on your bun, and you will both get to where you want to be, you'll see.
Bodger is always going to be fearful because of his past and god only knows what really happened to him, but even 10 months down the road now, he is still continuing to make progress and is starting to sleep during the day where I can see him, which he never previously did, he does DBF's and binky's like mad, and has discovered the joys of sitting on the window sill watching the world go by.
He will let me pick him up and occasionally likes a cuddle, but most of the time he kind of just tolerates it, but I do still pick him up daily, because I know that with such a complex bunny as Bodger, god forbid if he ever became ill, he would probably just die of fright if he wasn't used to being handled and was then needing to be, but your bun hasn't had all the terrible things happen to her that Bodger has, and he has already progressed much further than I would ever have dared hope, and so I really don't think you will have any problems getting your bun to trust you.