。
She studies fine art at school.
Literal
She [topic-は] school [at-で] fine-art [object-を] is-learning.
学ぶ ('to learn, study') is the slightly more formal/literary cousin of 勉強する ('to study') — more about acquiring knowledge or skill in a discipline than the cram-style drilling that 勉強 implies. 学ぶ pairs well with 美術 ('fine art'), which is an academic-flavored noun (vs. アート, the loanword for 'art' as a more casual or contemporary term). で marks the location of the activity. ~ている locks the studying into ongoing state: she is currently engaged in this course of study, not just attending one class. This kind of '~で~を学んでいる' framing is common in self-introductions and biographical descriptions.