Help Shadow Find Peace: A Loving Goodbye

This is my Shadow. She has been my friend and companion for many years. She has never in her life hurt a person until yesterday when she bit my nephew. She looked so broken, like she didn't know what was happening to her. She lost bladder control a few days ago and bowel control today. She just wants a nice soft blanket to lay on and some kids to play with. I really hope there is a doggie heaven because she deserves it. I'm asking for help because i am disabled and on social security. I dont have enough money to send her on to her next life. Please help me.