Her existing status stands on its own and is governed by its own conditions; it is not created or cancelled by your EB-5 filing. She may separately qualify as your derivative spouse, but derivative benefits depend on your petition succeeding, on visa availability, and on her individual admissibility.
Two statuses running on different clocks
Picture a spouse working in Texas on her own valid employment authorization while you remain in Deux-Montagnes. Her work permission comes from that independent basis, not from your pending EB-5 case. If she later pursues adjustment as your derivative, she must actually be eligible and a visa number must be available.
Follow the filing instructions for family members rather than assuming a separate petition is required for her. Ask which party's action each of her rights depends on, and you will stop conflating them. Her present authorization came from whoever granted her status and is maintained by conditions she and, where applicable, her employer must meet.
Any derivative benefit through you depends on your petition being approved, on a visa number being available, and on her own admissibility, none of which is within your control or hers. The practical consequence is that neither of you should time a resignation, a lease or a school year on the other's file. Confirm with counsel which filings each of you makes personally, and follow the instructions for family members rather than assuming a separate petition is required for her.