is that possible???

but I've never heard of non-shedding cats. My cat sheds everywhere, can't stand it. 

some cats shed their winter fur but if she is an indoor cat she wouldn't grow one LOL. What colour is she and is there much that brushes out  when you are brushing her? 
She probably drops fur like we do with our hair- so few it isn't noticeable.
Some cats are like this, consider yourself lucky! Nothing like having a white or black cat on your lap while wearing the opposite colour.
Maybe in her lineage she has a bit of one or two of these breeds of cat in her DNA.

  Two cat breeds are often touted as shedding a minimal amount. The Cornish Rex cat has short, curly fur that lies close to its body. The Devon Rex is similar and has curly fur that can be in a very thin coat across the cat's body. Both of these cats may shed less noticeably due to their short, fine fur.

and I do see some hairs come off when I stroke her but when I pick her up there is nothing on me
omg she is such a sweet girl

Some cats are like this- they have no need to shed (or shed much) while others dump hair like 'pig pen' on Charlie Brown LOL.   
I had a tri-colour spayed indoor female that didn't shed much (and thank goodness for that because her belly & legs were white). Then we moved where she was able to have the freedom to be indoor/outdoor and I noticed her coat got thicker in the winter because she spent a lot of time outside then. Come Spring...........ewwweey.