I think it depends on familiarity with bunnies. Unfortunately, I believe she might not care too much that you're gone as long as she's being cared for. I think she will fall into the new schedule. Bunnies are equipped to survive, therefore, adaptation to new situations is crucial to their survival. (like any species). Unlike dogs, or even cats- bunnies form a different kind of bond to their caretaker. I'm afraid you will miss her more than she does you...
In that sense, and using my own argument, once you come home and begin primary care she will recognize your voice and most likely respond in a positive way
I only think this way (not actually going by any extensive scientific studies or anything
) bc when I acquired Akina from my cousin she fell straight into my lifestyle, partly by necessity and partly bc my lifestyle was better than what she had, and did not show any interest a couple weeks after when my cousin visited her. So I figured it must be because of preference and familiarity (at that point she had just become used to me rather than my cousin).. Also, the rescue bunnies fall very quickly into new routines and seem quite comfortable- even the one that lived in a hamster cage O.o
So, have fun in America and try not to humanize Benji to the point of feeling like she's in dire depression because of your abscence.
Bless you both!!