。
She has a wonderful personality.
Literal
She [topic-は] wonderful personality [object-を] has.
~をしている is a special descriptive use of する meaning 'be characterized by / have as a feature' — used for innate or inherent properties: physical attributes, personality traits, characteristic looks. Common examples: きれいな目をしている ('have pretty eyes'), 元気な顔をしている ('have an energetic look'), 優しい性格をしている ('have a kind personality'). The を with する looks unusual at first glance but it's a fixed pattern — distinct from the action verb meaning of する. Compare ~がある ('have' meaning external possession): 性格がある emphasizes that she has a personality at all, while 性格をしている describes which one.