A few suggestions...
Did you run her on jack stands or a lift and drive it to help isolate issue.
You can rent a chassis ear from a lot of places (part stores) Or buy for $30 ish. The chassis ear is a bunch of alligator clams that you place on various locations on suspension components or various parts you believe the noise is coming from. You connect the clams to a central control box that allows you to switch between clamps and listen with headphones when driving. This will get you darn close to area it's coming from.
see you did replace the bushings (control arms) with poly replacements. Not to beat a dead horse but in my experience unless they are poly graphite or have a zerk fitting they will squeak. If I remember correctly There is a you tube video of someone demonstrating the noise. If it's not them it will most likely be the sway bar bushings
Can you take a video and post to site to better aid fellow members in diag?
