This is the 12398th most frequent Polish word.
myślała
"She thought."
The word 'myślała' is in the past tense, indicative mood, third person singular, used to describe her internal thought in the past.
Ona myślała, że to dobry pomysł.
She thought it was a good idea.
Here, 'myślała' conveys the act of thinking and considering something.
Myślała nad wyborem sukienki przez cały dzień.
She was contemplating her choice of dress all day.
In this context, 'myślała' indicates recalling or considering friends in one's thoughts.