Is she just doing this at night or is that just when it bothers you the most?
I made a suggestion a while ago on another post, but it might work for this as well.
Try sprinkling a small amount of feed &/or grit over your brooder floor into your wood chips (or whatever bedding you are using) and let them dig & scratch to get it. Remove the regular feeder for a couple hours when you do this. Should keep them busy & much quieter if they have to work a bit to get what they want. I usually do this at least once a day in my brooder & the chicks turn the chips for me this way so the poop gets turned under which reduces the smell & the chips stay fresher longer, thus lowering my workload & expense with not having to change bedding so often. Plus, I have much quieter chicks. Mostly what I hear now is little beaks tapping the bottom of the brooder, but it's much quieter than all that peeping.
I usually do it an hour or so before bedtime since their brooder is in my bedroom & this tends to wear them out so they are ready to go to sleep when I am. It also continues to occupy them when they wake back up in the morning until I put the regular feeder back in with them.