Ruminating on Ruminating

I learned a new word. 

Perseverate. 
 
To repeat something insistently or redundantly. To get stuck, to ruminate, to loop back over and over. And over.
 
As in, “My 91-year-old mother perseverated.” 
 
My mom passed away a year ago. But I’m still haunted by echoes of her three looping ruminations.