Sup!
I just want to tell you guys the easiest way to bring Quiet back (needless to say that this only works for PC). Most guides I've found use the QAR Tool and cmd commands to bring her back. I tried, but it didn't work. Searching a bit harder I found a solution that should work for everyone.
You just need to copy this link:
h.ttp://goo.gl/JodkAW (without that dot after the h)
The steps are right there. I used the 00.DAT method, haven't tried the other one, so you should use the same one.
I hope this helped you.
All credit to Shiryurj for fixing the file and Wasdref for uploading it.