Bless you for helping out.

Steve summed it up nicely, crickets are not garter food.

It is possible for your snake to live with paralysis as long as the internal organs are still functioning, but only in your kind care would it stand a chance.

This may sound sad, but to a crow garter snake livers are a real treat, the crow was trying to open up the snake to get at the liver.

Unfortunatly for the snake, the crows usually extract the liver and leave the rest for the snake to die slowly.

Best of luck with your recovery, I hope it has a happy ending.