3 sentences

1. 她是我老婆的密友。

   tā shì wǒ lǎo​po de mì​yǒu.

   She's a close friend of my wife.

   Source: OpenSubtitles

2. 我为几个密友办了晚宴。

   wǒ wèi jǐ​ge mì​yǒu bàn le wǎn​yàn.

   I gave a dinner party for a few close friends.

   Source: CCMatrix

3. 她的密友很少。

   tā de mì​yǒu hěn shǎo.

   She has very few close friends.

   Source: Tatoeba