I was called on as an uke when I was 5th Kyu.I was one of those people who could take ukemi pretty well so she assumed I was a higher rank.I wasn't and I should have listened to my sensei,and removed the hakama during seminars.She clobbered me,and I learned my lesson.
Did you get hurt?
Maybe she called on you because you could take ukemi pretty well and not because she assumed you were a "higher rank." Did you ask if she thought you held a higher rank or is this your own assumption you're bringing in here?
If you can take the ukemi, what difference does your rank make?