First of all your DP needs to arrange a meeting with your MiL consultant so he can find out exactly what is happening.
I very mush doubt if they will send her home on her own if she is so incapacitated.
If it is impossible for any family member to be with her , if that is the case, I think you need to have social services involved so at least they can help find a nursing home for her to continue her treatment. My local hospital has a "halfway house "unit just for situations like this and there may even be a similar place where the MiL is.
German voters slide inexorably to common sense …
Retiring and living frugally in money from downsizing after years of stress


