Contracts she negotiated and signed, price lists and market decisions she approved, personnel files showing hiring and discipline she carried out, expense approvals, board or shareholder minutes recording her authority and financial statements she reviewed. Pair them with an organization chart and a time-allocation table.
Prove the authority with things she actually signed
A duty description is an assertion; the documents behind it are evidence. For a small genetics exporter the useful exhibits are the supply agreement with the laboratory bearing her signature, the export permits and regulatory filings she is responsible for, the price schedules and customer terms she set, the employment agreements and any written warnings or performance reviews she issued, expense and purchase approvals over a defined threshold, and minutes or resolutions in which the shareholders delegated operating authority to her. Financial statements with her review notes show budgetary control.
Add an organization chart for the Canadian company naming each person and their role, a parallel chart for the U.S. subsidiary as it will stand at filing and at twelve months, and a table allocating her time by percentage across the duties listed. Payroll records for the last continuous year establish the employment requirement.
Provide certified English translations of the French-language exhibits. The exhibits should tell the same story as the letter; where they do not, revise the letter.