Nishko, In the C152 you will be at or close to the forward C of G limit IF you are within weight limit. So, the aircraft is actually reluctant to spin. I had some short Instructor trainees where the C152 would not spin until I got to adjust their seat right back (mine is already right back). Unfortunately they then don't reach the pedals and can't recover. However they can watch me recover to al least have some idea.
If you flew the C152 overweight, then you should not have been there AT ALL.
Spinning from 2800' ?? How deep can you go underground? Answer 6'.
Without knowing the particular situation, it's hard to tell what the examiner / instructor had in mind. Perhaps s/he just wanted you to say "we can not do that" and explain why, if necessary with calculations. Some month ago there was a thread here about flying the C152 overweight. Do a search and see what the wisdom was there.
Remember - if you don't get your rating today because you did not spin - you can come back tomorrow. If you do a spin that you should not have done - you might not be able to come tomorrow. Unless your name is Lazarus.