So the brightness is better ... but is the screen still too warm?
I'm doing everything I can here, but in my bones I really do fear that you are going to need a new screen soon.
Unless you have reason to believe the lab messed up your order somehow, the prints you have are fine. You need to make your screen match them, period. And that begins by being in good light.
I know, it's one of the most persistent myths floating around.
Editing in low light is completely nonsensical. As soon as you stop and think about it you realise this is so.
Yeah, it's not a wide gamut screen.
I've just been playing with my NEC, but the controls aren't quite the same.
If you go up one step to get to "WHITE", can you then use the left and right arrows to adjust the white temp?
It is related to resolution and quality of course, but by itself the jpeg file size is not a firm indicator of those things.
You need to explain to her that smaller jpeg size is actually an indication of better file quality.
https://www.damiensymonds.net/2015/08/about-jpeg-file-size.html