She comes from a well-to-do family.

她出身于一个小康之家。

《新英汉大辞典》

The modern child of a well-to-do family nibbles at only half the things he gets; the greater part of his world is wasted on him.

今天家境富裕的孩子所获得的食物，多半没有被消化而给糟蹋掉了；他们世界的大部分都在他们身上浪费掉了。

youdao

Peyton Farquhar was a well-to-do planter, of an old and highly respected Alabama family.

佩顿·法夸尔，家境殷实的种植园主，出身于阿拉巴马州一个古老的望族。

youdao

The ranch could also sell to a pro athlete or a well-to-do family looking for a private residence where the kids can hone their athletic skills.

FORBES: If The Hunger Games Were Real This $7 Million Ranch Is Where You'd Train

Miyauchi was born to a well-to-do family in the lumber business in Kobe.

CNN: FLYING AGAINST THE OLD WAYS

Langley and Homer Collyer came from a well-to-do family from the Hudson Valley.

FORBES: They've Gotta Have It