I think puzzles for food are ok up to a point, to occupy a dog quietly for some down time. But just be careful, especially with a young dog, because not being able to eat easily can turn into frustration.
I also don't think it's right to ignore a puppy crying. She is an infant, she has just been uprooted from all she knows, and meeting her emotional needs is as important as meeting her physical needs. There is also evidence that leaving a puppy to cry it out is psychologically damaging.
Have a look at this, I think you will find it interesting - New puppy?
What are you 'correcting' her for? Maybe it's just the choice of word, but she needs to be shown what to do, but not corrected if she gets it wrong (or even hasn't guessed whatever it is that you expect).
I also don't think it's right to ignore a puppy crying. She is an infant, she has just been uprooted from all she knows, and meeting her emotional needs is as important as meeting her physical needs. There is also evidence that leaving a puppy to cry it out is psychologically damaging.
Have a look at this, I think you will find it interesting - New puppy?
What are you 'correcting' her for? Maybe it's just the choice of word, but she needs to be shown what to do, but not corrected if she gets it wrong (or even hasn't guessed whatever it is that you expect).