。
I think she'd make a good teacher.
Literal
She [topic-は] teacher [for-に] is-suited [quotative-と] think.
~に向いている means 'to be suited for' or 'to be cut out for' — 向く literally means 'to face toward,' and the metaphorical extension is 'to be oriented toward a role or profession.' The subject switches implicitly mid-sentence: 向いている describes her, but 思う is the speaker's action — Japanese handles this subject shift naturally without an explicit 'I.'