I have a Russian Jewish friend who’s wife passed away last Thursday. 5 days ago. We live in a small community without a rabbi. My friend has dementia so his daughter (who married a Christian) is letting her gentile husband make all the arrangements for the funeral. She asked me as a knowledgeable jew to do the funeral but they are pushing off the burial for at least 6 days, I assume so they can get more family members to attend. I am uncomfortable with this. Should I ignore halachah and lead the funeral service? I’m not sure if I should be involved in a non kosher funeral.