This is the 13105th most frequent Polish word.
odwiedzały
"Visited" (referring to a plural, feminine subject in the past tense).
"Odwiedzałyśmy" is used here as the third-person plural past imperfective form of "odwiedzać", indicating that the action of visiting (done by a group including females) occurred repeatedly in the past.
Kiedy byłyśmy małe, często odwiedzałyśmy naszą babcię.
When we were little, we often visited our grandmother.
"Odwiedzały" describes an incomplete or habitual action in the past performed by a group (with a possible mix of genders or exclusively female).
Za każdym razem, gdy odwiedzały muzeum, dowiadywały się czegoś nowego.
Every time they visited the museum, they learned something new.
"Odwiedzały" refers to multiple visits to different locations performed in the past, specifically by female students.