5 inches of raw sewage flooding crawl space

Hi, my name is Emma. I am 23 years old, I am now taking full-time care of my grandma who is diagnosed with dementia, leaving me with limited options for work... Raw sewage flooded my crawl space and will potentially damage the structure of my home if not taken care of. If the house supports shift downwards because of the flooding, my house will eventually sink into the ground. The sewage is also entering my home through anywhere possible, my grandma and I won’t be able to use the restroom, shower, or sinks until it’s fixed. The plumbing company will have to drain out the sewage underneath and replace all the pipes. I've spoken to 5+ companies and the lowest quote with as many discounts as possible came out to $18,697. This is a long shot, but truly anything helps. I don't really know my options and asking for donations feels a bit odd for me, I'm scared and stressed. Thank you for reading.