i don't have experience with this exactly (i lurk here as a married mom who is dealing with the possibility of becoming single), but i have left my currently-night-nursing toddler for overnights with his dad twice. this was at our home, while i spent the night elsewhere. he wanted me in the night - i don't think it mattered about nursing. i mean, he would have wanted me even if he were night-weaned, or completely weaned.
otoh, i did night-wean my older son at 18 months, in preparation for the birth of his younger brother. i used the no-cry sleep solution for toddlers, and we were able to accomplish it with no crying or freaking out. i look back on that, and look at my current night-nurser, and think, "how?!" but we did. (and he continued to nurse until 3 years, 3 months.)
i think it would be nice for her to keep the closeness of night-nursing when you are together, if you want to continue. i don't think that would make it harder for her to be away from you at night. but if you feel it's best, or would be less confusing for her if she were night-weaned, then i want to reassure you that it doesn't have to hurt your nursing relationship. good luck!