She probably was more worried about them (wrongly) than about herself - that is, she was probably afraid they’d feel abandoned, deceived, etc. Of course, some of them might have; but others would have started thinking...
Prayers for her in any case. Alzheimers in anybody is a horror, but in a person who was recognized as brilliant and gifted in her field, it must be twice as hard. Muriel Spark, the British philosopher/novelist (and Catholic convert), had it, and IIRC, her husband wrote about it later.
And I'm not castigating her. Her motives are not known to me.