In point of fact, orders are revoked every hour of every day in the Armed Forces. In Maj. Cooke's case, his orders were revoked because he was a non-ob officer who actually "volunteered" for deployment a few months before he filed his TRO. To the Army, it just wasn't worth the nuisance value to fight him in court - it was a decision of financial expediency, nothing more.
In this Captain's case, she's already lost her TRO. The time to "revoke" her orders would have been before the TRO was adjudicated, like it was in Cooke's case. As Rhode's is a (probably) obligated officer and this is a involuntary deployment, her orders aren't going to be changed, or revoked. If she refuses to deploy, she'll certainly be facing a court-martial for a number of UCMJ violations.