It depends on which entity employs her there. If she joins the operating mill that has been trading for years, the ordinary rules apply. If the group forms a new American holding company to acquire it and that company is the petitioner, the new-office rules may apply and the initial approval is limited to one year.
The petitioner's own age matters more than the deal date
Acquisitions are usually structured for tax and liability reasons, and the vehicle chosen has consequences nobody flags at closing. Where the petitioning American entity has been doing business for a year or more, an approval can run for the ordinary initial period. Where the petitioner is a newly formed company, the petition is a new-office case: the initial approval is for one year, evidence of secured physical premises and of capacity to support the role is required, and an extension has to show what the first year produced.
Marise's own clock runs separately. Her qualifying year abroad must be complete within the three years before the petition is filed, so a long pre-closing period spent in Michigan can push the filing date later rather than earlier. The maximum stay in managerial or executive capacity is seven years, and that ceiling should shape the plan from the beginning rather than surface in year six.