。
She donated to the Red Cross.
Literal
She [topic-は] Red-Cross [to-に] donated.
寄付する (きふする) means 'to donate' — a compound of 寄 (to draw near) + 付 (to attach), literally 'to attach something toward [a cause].' The に marks the recipient of the donation. 赤十字 (せきじゅうじ) is the Red Cross.