Sory to hear of your cousin's demise. Cheapest option for burial is a cardboard coffin and a burial in the garden. Not, as some think, illegal, but some might not be happy about leaving loved ones behind when they move house. Other option is a "woodland burial" but some land owners have jumped on the "natural burial" bandwagon and turned this into an expensive option. I have seen a brochure where a "hand woven willow basket" has cost more than double an "oak veneer" casket from your bog standard high street funeral director. Funeral directors will want to pump her full of embalming fluids. Avoid at all cost, it is completely unnecessary unless you are planning on keeping the deceased in a warm place for several days. If your cousin is in the cold mortuary, embalming, is again, unnecessary.