elder Care help?

I am hoping that some of you are well-versed in Elder Care financing in Washington State... I'm at a loss at the moment....
My mother is currently in a nursing home in Tacoma I believe the place charges about $4,000 a month of which 3000 is paid by Medicare so my mom has to pay a thousand a month...
My grandmother had been paying that for her but my grandmother passed away on April 26th. It appears she didn't leave any money behind from Mom so now we have to figure out how Mom can pay her bills and pay her rent on her $900 Social Security....
I suppose one option is she just stops paying the bills..... I could probably chip in the other hundred a month and she didn't least be able to sustain.... But there's got to be another way.... The medical bills are going to pile up and they already have.... There's a ton of bills from Grandma's passing..... And we are in the midst of wrapping up Grandma's life... But now I'm extremely worried about my mother..... She has to be in a facility because she has to have care..... She can't stay with family.... We're going to sell the trailer they were living in before but that's only a few thousand....
I'm really scared for my mom right now 😟

Have any of you found some way around these things?