ACPO sharing of account near Canada?

Hello. Whether ACPO share the record of step down offences next to the Canada? my friend was booked for an offence 'c-category', and than get off the hook by 'discharge caution'. She was never charged after that. Now my buddy wishes to apply for Canada and they require a police certificate. I was wondering what would ACPO issue her? (a) No trace found or (b) no criminal register against you? should she mention about that incident which occurred 5 years ago, for an felony which has been stepped down?
Appreciate your answers.
They would issue a "no copy found" letter.

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