Looking at the list one thing that really jumps out as not worth it are the stainless steel brake lines. I doubt your GF plans to turn the golf into a track beast, and with what I'm assuming is a street car you should probably put the money elsewhere.
I wouldn't put those that high at all. I would say mounts, springs, sway bar, and short shifter are all way more worth while upgrades, and a difference you would actually notice. Brake fluid is more important than the lines even.