In situations like this I KNOW you can't just throw everything away but neither can you let things as they are go on. You something nuanced and different to each hoarder, but it will involves some therapy, getting rid of stuff and keeping stuff.
She seems like a cunt herself but well, its done now and hopefully wont turn into her old self later when she is doing well again later. Maybe fix the hoarding stuff first whilst still keeping memories without the trash, hell, some of them could be expensive ass vintage by now, good money from that