"High" will NTR is probably a misnomer, as if you play your cards right, Liz will end up at 7% will "only" after this update (which is what you're aiming for if you want a couple of pictures that you won't be able to unlock otherwise). Be advised though that at this stage, pursuing high will locks you out of the nascent NTS route (or rather, going for NTS utterly destroys Liz' will in one go), which means high NTR is another route by itself, basically.
Liz' will score will probably change some more in the next updates, though (it already did a couple of time; a few updates ago, it was easy to have her at a negative will score before the camping trip, which is no longer possible), as NosyFellow keeps adjusting the values, and I guess he'll keep doing it until he finds the sweet spot.