This is the 15263rd most frequent Russian word.
поселилась
"Settled" or "took up residence."
This illustrates the physical action of establishing residence at a location, such as moving into a new house.
Она поселилась в маленьком домике у реки.
She settled in a small house by the river.
Here, 'поселилась' is used metaphorically to describe the inception of a persistent thought or idea in someone's mind.
Идея о переезде поселилась в его голове.
The idea of moving settled in his mind.
This indicates the conclusion of a search or a journey by establishing a permanent residence.