Wife had a wreck last night

1. So glad to hear the wife is fine. Modern cars are great and safety features are a wonderful thing.
2. The insurance company is going to send an adjuster out to look at the car. The adjuster writes an estimate of his own. At that point the body shop will know to start repairs or not.
Here's the kicker, when the body shop starts the tear down, they may (very likely) find hidden damage. The B/S will submit a supplement to the insurance co estimate. No big deal unless you're teetering on the edge of a total.
If the car is inside your total # they will fix and life is cool. If not, then you get a check for the value of your car prior to the accident. There is a 3rd option, but lets hope it doesn't come to that.
3. As for diminished value, (or DV) you are looking at a catch 22 here. Your uninsured motorist policy is paying for the repair. You're in a unique position that you are the payer and the payee. In short, you're not likely to get that from your insurance co. but it won't hurt a thing to ask.
4. Don't be surprised if the estimate that is written isn't loaded with aftermarket and salvage parts. That may be the difference between a total and a repair.
5. Not all is lost! The driver of the car that hit you is on the hook for the DV as well as any other cost's you incur. The down side, it becomes a civil issue and that means lawyers and court. A court case you likely will win. From what I understand, Texas has an issue with deadbeats. The next thing is collecting.
The best suggestion I can make is to approach the prosecutor, explain the situation and hopefully a judge will make it so she can't can't have a license until she makes you whole. But it's been my experience that she'll just drive without a license.
Good luck! The process sucks, but I've lead many a person thru it and you'll be ok.