2004 Prius Battery dies while Driving

Hello,
Today I was driving on the highway in my 2004 Prius. I was going about 70 mph when the car would no longer accelerate when I pressed the gas pedal.The check engine light has been on and off for the past week or so, but my car has wiring issues, and this isn't uncommon. I ignored it, which turned out to be a mistake.

I immediately put on my hazard lights and pulled over to the side of the road. The red exclamation light came on on the dashboard once I was stopped. The display is showing that I have a dead 12 volt battery. The thing is, I just replaced that battery with a brand new one about a month ago.

I have full gas, and I just checked the oil yesterday and was at a good level. Does anyone know why my car would die like this while I was driving?

 

I don't have any codes yet. I had to get it towed to the closest dealership and they're going to run a diagnostic in a couple of hours.

The inverter coolant pump has never been replaced, and it hasn't been inspected in a while.

Thele AC in my car was off when I had this problem, and I never attempted to turn it on when I pulled over.

The dealership thinks the hybrid battery died, and if so, that means my car is totaled...