I think the restraining order point is that they are not hard to get. In most states a TRO (Temporary Restraining Order) or protective order is granted pending a hearing. This strips the person of gun rights pending the hearing. Lose the hearing and it's made permanent and hard or impossible to change.
To answer the OP - you'd just have to do everything in your power to fight it.
If she were convicted of a felony, she'd go to lockup. Would your marriage survive 1, 3, 5, 10 years of prison for your spouse?
If it did, she'd be an ex-con when she gets out. Probably have significant $ problems after. But as long as she isn't in possession of a firearm or ammo, or have constructive possession, you'd be fine. But the practical matter means you'd have to keep all guns and ammo locked up out of her access or on your person at all times. Or you'd be in trouble for providing a firearm to a felon.
Same rules, basically, as for having underage kids who cannot lawfully possess handguns...