Thanks everyone.
It's so sad.
My mother is 79 years young. She is fit, active, and has created a good social circle since she moved here four years ago. (She'd gone into total isolation so this is huge.)
Her life has been hell too. Lost a husband and two sons and never fully recovered from that, but she was beginning to bloom down here.
To look at her you wouldn't know she had a time bomb ticking away.