Forgot to mention
Well, I've forgot to mention this last time that I did take the pup to the vet and she had a thorough check up and her injections. Nothing is wrong with her ears. She is still not very responsive and she is very different to any dog I had so far. The vet did a hearing test with her and it was o.k.
Now I do wonder whatelse it could be? Maybe you have got some idea?