Engine Fire: Grandma Needs Your Support

I am a grandma that needs help. I purchased a use car from a local car lot. I only had it for three months before I started having issues with it. On Halloween the engine caught on fire. I am in desperate need of getting it fixed. I was told I have to have a new engine. I need to get my grandson back and forth to school and his appointments. I am on a fixed income and have tried everything.