She seems to know everything.

Literal

She [topic-は] anything is-knowing [way-に] looks.

~ように見える — literally 'looks in such a way as to' — softens an assertion into a perception: 'she seems to know everything,' not 'she knows everything.' Note the kanji 様 here serving the function of the more commonly hiragana-written よう; both are acceptable, with hiragana favored in modern casual prose. 知っている (the resulting state of knowing) almost always pairs with this expression — knowing isn't an action you perform, it's an ongoing state you possess.