It would be a good idea for her to contact the people she sponsored and make a list of the number of people ... and the dates of the sponsorship ... which can go for more than 10 years.
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It would be better to enter a accurate number since the forms are signed under penalty of perjury so its advisable to do her best to obtain the most accurate information.
She should try to remember how many people and put the correct number since the affidavit requires her signature and is a binding document.
Samuel Ouya Maina, Esq. 415.391.6612 email@example.com Law Offices of S. Ouya Maina, PC 332 Pine Street, Suite 707 San Francisco, CA 94104