I think if she had told me right away I could have done all this troubleshooting 6 months ago (replace 12v and fuse) and the car would have been fine, including hybrid battery. But now that it's been sitting for 6 months hybrid battery needs some juice. But at least the ICE is running.

 

If it's running, you don't have a battery fault code, and the car provides normal assist and regen, absolutely no need to take it to the dealer.

I don't know the Camry specifically, but the Prius works this way. After disconnecting the reconnecting the 12V, does the Camry charge the hybrid battery at idle for at least a few minutes? If it does, I would do this twice.



Then I would set parking brake, push and hold brake and then floor the gas until it shows 8 bars AND stops showing flow into the battery.

EDIT: Must also be in "D" to force charge... doh!

 

Drive the car until it gets up to temp for at least 4 or 5 miles. Shutdown and repeat after 15 or 20 minutes of downtime. Repeat the cycle for the third time. After it cools off, start the car as normal and see what it does. You might have a system fault that will need three driving cycles to clear or a techstream or other scanner to re-set the system.