How do I undo a garnishment for back taxes?

Q. I received a notice from the IRS about one of my employees who owes back taxes. It said the taxes were to be garnished from her paycheck. I forwarded the form to our payroll company, which started the deduction. I informed the employee, who then called the IRS and now has a Release of Levy form. Is it too late to stop the payroll deduction at this time? Did I do this correctly? Was there anything I should have done differently? Thank you. – Kim, Maryland