I finally heard from my MIL today.
The other day I had seen my SIL on facebook and asked what's up with her mom. She had told me her grandma had surgery in the hospital, but that's all I really knew.
Well, it turns out gramma has cancer. I don't know anything more than that. That's why she was in the hospital. My MIL is more or less staying at her house during the days while her brother (B's uncle) is at work. I am not really sure what else is happening. What kind of cancer, if it was early detection or not. I don't know. I do know the last time I was out there, she wasn't feeling well and was being stubborn about it. I think they were chalking it up to age.