OP, on your clicking, check the PS level when cold and level...should be to the second mark on the 'cap dipstick.' It's the reservoir that says "ATF only" That's the power steering reservoir.
Also bleed the system by turning the wheels to full lock, left and right, about 3 times each. I roll slowly in my driveway and just do "S's."
Look under your gf's car for anything funny looking...paying attention to the rear subframe (around the rear, rear axle carrier bushings).
Could be diff whine too...could be tires...could be tire pressure--make sure they match the door jamb pressure.
Upcoming NYC dates: Jan 8 and 27. See Facebook for other shows and PM me if you can make one...love to see you there!
Mangofy your E46!