An adjacent building being demolished collapsed on the thrift store in June, killing six and injuring 13 others.
A demolition subcontractor is charged with involuntary manslaughter.
Lawsuits over the collapse are on hold amid a criminal investigation.
But a lawyer for the woman, Mariya Plekan, wants to preserve her testimony because of the gravity of her injuries and the delay expected before trial.
Lawyer Andrew Stern says the 52-year-old Plekan also suffered organ damage and remains hospitalized. But he says her mind is sound.
A spokeswoman says the Alexandria, Va.,-based Salvation Army has no immediate comment.