Any word on that UI tip I gave you, bud? Turned out a guy's dad here at work had that exact problem causing confusion and they "missed" it till he insisted they check.
My dad didn't metabolize Oxycodone/cotin and they said he was suffering from dementia. I made the quit the meds...and s-l-o-w-l-y he came out of it and was fine: 29 days in the hospital! :(
Prayers for your MIL to wake up and be crip minded and headed home.
[that was to be typed "CRISP" minded...doh. :(