9 FAM 403.11-3(B) (U) When You May Not Revoke A Visa
(CT:VISA-1463; 02-01-2022)
a. (U) You do not have the authority to revoke a visa based on a suspected ineligibility or based on derogatory information that is insufficient to support an ineligibility finding, other than a revocation based on driving under the influence (DUI). A consular revocation must be based on an actual finding that the individual is ineligible for the visa.
b. (U) Under no circumstances should you revoke a visa when the individual is in the United States, or after the individual has commenced an uninterrupted journey to the United States, other than a revocation based on driving under the influence (DUI). Outside of the DUI exception, revocations of individuals in, or en route to, the United States may only be done by the Department's Visa Office of Screening, Analysis, and Coordination (CA/VO/SAC).
The original officer likely lacked the authority to actually revoke her visa:
https://fam.state.gov/fam/09FAM/09FAM040311.html
9 FAM 403.11-3(B) (U) When You May Not Revoke A Visa (CT:VISA-1463; 02-01-2022)
a. (U) You do not have the authority to revoke a visa based on a suspected ineligibility or based on derogatory information that is insufficient to support an ineligibility finding, other than a revocation based on driving under the influence (DUI). A consular revocation must be based on an actual finding that the individual is ineligible for the visa.
b. (U) Under no circumstances should you revoke a visa when the individual is in the United States, or after the individual has commenced an uninterrupted journey to the United States, other than a revocation based on driving under the influence (DUI). Outside of the DUI exception, revocations of individuals in, or en route to, the United States may only be done by the Department's Visa Office of Screening, Analysis, and Coordination (CA/VO/SAC).