Tell her this monitor offers 78% more pixels compared to 1080p. If you couple that with a 2.75x in refresh rate means you'll drastically increase productivity and finish your work in no time at all. You could argue that the increase in productivity means this thing will pay for itself before you know it 8)
Ummmmm....the kids spilt water in the old one..
Primarily due to the XG2703-GS and AG271QG having options to control the gamma (unlike the XB271HU), without such option (or proper calibration with the use of a colorimeter) you could easily be stuck with washed out colours (due to a low gamma). According to NCX, the XB271HU also has the worst overdrive (by a small amount) of the four (from Acer, Asus, ViewSonic and AOC). Also, the XB271HU notoriously (with a lack of sharpness control) can appear blurry and less sharp than the alternatives from the 3 other brands.
Any reason at all for picking those 2 ?
I would easily pick the XG2703-GS or AG271QG over this. Though, I wouldn't get any of them since a new panel is due for release very soon.