Puzzles? Like in lots of pieces that are assembled into a picture? Or as in riddles and logic challenges and such?
If it is riddles, etc. then it seems to me the answer wouldn't be in more practice.
If everything comes to you in a flash, the problem with challenges is that you've never learned how to develop tactics and strategies to subdivide and solve differently. So, instead of accidentally possibly expanding the depth of her flashes through repetition of such tasks, try talking out loud with her through methods of analysis, sub-dividing problems, recognizing themes and patterns in puzzles would be much better than just doing more of them.
The answer is the riddle: How can you eat an elephant?
One bite at a time.
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