Hello Rutger !
First of all, a small pause is just what you could need; I've heard that even J.Bream takes a month off of the guitar every year and goes fishing !
Secondly, I believe that - besides all the magic that is already in the guitar - maybe you have to define/redefine motives and targets; I.e, myself, I have a 2-3 year target to my degree, and also smaller targets like the upcoming music school concert ! I also have future dreams that aren't even clear yet, like create different paths and/or compositions and so on !
A change of the teacher could also help - I believe that a very good teacher is very essential in upper levels. A new and great teacher could give you new perspetives! (that does not necessarily means that the current one cannot - you could discuss with her as already mentioned )
Finally, for many reasons, I vote a big NO to being a teacher of yourself!
Tell us what you think regarding the above advices / ideas !
ps. let me thank your from here too for our smooth transaction!