This is the 1450th most frequent Polish word.
zmieniła
"Zmieniła" means "she/it changed" in English.
The word 'zmieniła' is used here in the past tense, feminine gender, to indicate that she changed her opinion or decision.
Ona zmieniła zdanie po rozmowie z przyjacielem.
She changed her mind after talking to her friend.
Here 'zmieniła się' is reflexive, showing that the condition (weather) underwent a change.
Pogoda zmieniła się na gorszą w ciągu godziny.
The weather changed to worse within an hour.
In this sentence, 'zmieniła' describes an intentional action taken to alter one's personal style.