。
She performed a sonata.
Literal
She [topic-は] sonata [object-を] performed.
演奏する ('to perform [a piece of music]') is the dedicated verb for instrumental performance — distinct from 歌う ('sing') or 弾く ('play [a stringed/keyboard instrument]'). The compound 演 ('perform') + 奏 ('play music') ties together the broader 'performance' notion and the specific 'making music' image. ソナタ is the loanword from Italian 'sonata' (via German); Japanese music vocabulary leans heavily on Italian and German loans for classical music alongside English for popular and jazz. The bare 'ソナタを' without further specification suggests a generic sonata — perhaps one already established in context.