On the surface she can be very pleasant and helpful, but underneath she’s got problems.

面上她亲切和气又乐于助人，可实际上她也有难题。

She was unfailingly courteous and helpful.

她无论什么时候都彬彬有礼，乐于助人。

She’s always helpful and complaisant.

她总是又殷勤,又乐于助人。