I can see both sides - your concern for what you see as unexpected changes in her personality including the belief in aliens and her changes in habits, beliefs, etc as she goes through another phase in her life.
She might be in pain, exhausted, in the stage of 'women of a certain rage', questioning her pervious beliefs, habits and in a state of no longer caring as much about things as she used to, like eating well or never taking medication.
It reminds me of this poem:
WARNING (I SHALL WEAR PURPLE)
Jenny Joseph
When I am an old woman, I shall wear purple
with a red hat that doesn't go, and doesn't suit me.
And I shall spend my pension on brandy and summer gloves
and satin candles, and say we've no money for butter.
I shall sit down on the pavement when I am tired
and gobble up samples in shops and press alarm bells
and run my stick along the public railings
and make up for the sobriety of my youth.
I shall go out in my slippers in the rain
and pick the flowers in other people's gardens
and learn to spit.
You can wear terrible shirts and grow more fat
and eat three pounds of sausages at a go
or only bread and pickles for a week
and hoard pens and pencils and beer nuts and things in boxes.
But now we must have clothes that keep us dry
and pay our rent and not swear in the street
and set a good example for the children.
We must have friends to dinner and read the papers.
But maybe I ought to practice a little now?
So people who know me are not too shocked and surprised
When suddenly I am old, and start to wear purple.
However, it does sound like she has changed and I think I would be concerned. I am not sure what I would do with that information though.