This is the 11760th most frequent Russian word.
заинтересовалась
"Got interested" or "became interested."
'заинтересовалась' conveys the feeling of developing an interest in the object 'музыкой (music)' in the context of someone's age.
Она заинтересовалась музыкой в раннем возрасте.
She became interested in music at an early age.
'заинтересовалась' is used to specify the emergence of interest in a particular area, 'искусством Италии (Italian art)', after an event.
После лекции она заинтересовалась искусством Италии.
After the lecture, she became interested in Italian art.
'заинтересовалась' indicates the beginning of an interest in the subject 'математикой (mathematics)' as observed by another person.