This is the 13377th most frequent Polish word.
otworzyła
"Opened" (feminine singular, past tense).
Here, 'otworzyła' is used as the past tense of 'open' concerning an action Maria performed on a physical object (the window).
Maria otworzyła okno, aby wpuścić świeże powietrze.
Maria opened the window to let in fresh air.
In this sentence, 'otworzyła' describes an action completed by Joanna, opening a door to encounter something unexpected.
Kiedy Joanna otworzyła drzwi, zobaczyła niespodziankę.
When Joanna opened the door, she saw a surprise.
Here, 'otworzyła' pertains to Anna performing a deliberate action to unfold the pages of the book, exposing its contents.