Prius fell into a ditch of water, master triangle light, brake ! light, air-bag light on.

So, during July 4th, it flooded here in Houston. As my girlfriend was trying to turn around to escape possible flooding, her car fell into a ditch of water that covered basically half of the front wheels and got into the front driver and passager seat area of the cabin. She got the car towed to her house, but now it has the red triangle light, brake ! light, and air bag light on. The A/C works, and there's no indication of water getting into the engine. The inverter water pump is working. And everything in the trunk area is bone dry (as only the head of the car was partially submerged in water). The regenerative braking system no longer works, and the brakes make an extremely loud screech when the brake pedal is pressed. At this point is the car a total loss?

 

Thank you guys for all the advice! At this point, my girlfriend and I aren't too optimistic of the condition of our 07 Prius. We bought the car for $3500, with 156,000 miles (it now has 166,000), and it was her first car. It's been really emotional for her, but seeing that the repairs will probably outweigh the value of the car, we're thinking of just selling the car for parts to my mechanic and purchasing another used prius today. I'll keep you guys updated on how it goes!