Not necessarily, but the petition must describe the assignment accurately as of filing. If Priya's knowledge relates to integrating the formulation model with batching controls, a control-system change after filing may require an amended petition if the duties materially change.
File on the facts that exist, then amend if the facts change
A petition describes a specific U.S. assignment, and USCIS approves that assignment. If the described work is to install the company's formulation model and train U.S.
staff on its rules and tolerances, a later change in the mill's batching hardware does not necessarily change Priya's duties, because the model is the company's and the hardware is a vendor's. If, however, the specialized knowledge claimed is specifically her integration of the model with the current control system, and that system disappears, the basis for the assignment shifts and an amended petition may be needed. The safer drafting describes the knowledge at the level of the company's own methods and treats the control interface as one application of it.
On timing, an acquired mill that has operated for over a year supports an initial period of up to three years, and the year abroad must be complete on the filing date. Plan the installation start after approval and admission; she should not begin productive work on visitor entries in the meantime.