。、。
She is very beautiful. What's more, she's very wise.
Literal
She [topic-は] very beautiful. On top of that, very wise.
その上 ('on top of that, what's more') is a sentence-initial connector that adds an additional fact reinforcing the previous one. It's noticeably more formal than the casual あと and slightly more written than しかも. The second sentence reuses the same topic by ellipsis — 彼女は is dropped because it's still in force from the first sentence.