。
She practices the piano in the afternoon or evening.
Literal
She [topic-は] PM [or-か] evening [at-に] piano 's practice [object-を] does.
~か~ ('X or Y') uses the question particle か as a disjunction connector — same mechanism as in either-or questions, but here just listing alternatives. The に attaches once to the disjunction as a whole: 午後か夕方に means 'in the afternoon-or-evening.' ピアノの練習をする pairs the verbal noun 練習 ('practice') with する; the alternative ピアノを練習する would also work but feels slightly less natural for habitual practice. Piano lessons are a fixture of Japanese childhood education for many families.