Proper Buriel for 17 yr old Sister

My 17 year old sister was killed by accidental shooting with one of her friends December 23rd. This is completely unexpected and we are still struggling with the loss before Christmas. We wish to see her out of this world properly and have her buried in a casket with a prayer to God. We do not have a lot of money so anything that anyone could do is deeply appreciated. Thank you all and hold your Loved ones extra tight this year.