I'm sooo sorry about your MIL, I hope she is okay and they find and are able to fix whatever the problem is.
I understand this more than you know. My DH found his mother lyeing (sp) outside on her front steps last summer in the heat. She was dilireous, sunburnt and we are just lucky that she had hurt her back a couple of days before which is the only reason my DH was going up to check on her that day or no telling how long she would have been there.

Anyway, things happen that you cannot help and I am quite sure everyone that supported you will totally understand.

Thoughts and prayers are with you.