My position is that if she is injured mentally or physically, and or it will take money to rehabiliate her, that is when you sue. If you sue just b/c you think you can get money out of them or b/c you think they're jerks for not being sensitive enough, you're just fueling the "I'm going to sue McDonalds for having hot coffee" society mentality, which is why we have some seriously crappy restrictions, corporate liability paranoia, and expensive car insurance.
I hope your wife is ok, good luck!