Unfortunately, these online loan places have to depend on things like credit score, as they don't have the manpower to do individualized underwriting. I doubt that you can get thru to a person who can deviate from the rules.
Even banks, which appear to have people involved, are less flexible these days than they used to be. You may need to find a lender who specializes in low-credit-score individuals.
I wish you good luck.
PS: Reasonable funerals don't cost $13,500, so that part of your story will sour any underwriter.