Question

Selena had an unexpected surprise when she attempted to duplicate a copy of a culinary dish she learned in culinary school. What is the best way to rewrite the sentence to avoid repetition?

Answer 1

The best way to rewrite this sentence to avoid duplication is "Selena was surprised when she attempted to duplicate a copy of a dish she learned in culinary school."

A surprise by definition is unexpected, so it's a bit redundant to say an unexpected surprise. Also, saying culinary twice isn't necessary. It is better to just use it to describe the school and from there it can be inferred that the dish is culinary.  

Answer 2

Selena had an unexpected surprise when she attempted to duplicate a copy of a culinary dish, which she learned in school.
 

Its ok to repeat she just not a lot. but its not ok to reapeat culinary.