YOU SAID:

So,i was thinking in date her friend

INTO JAPANESE

だから、デートで彼女の友達を考えていた

BACK INTO ENGLISH

So I was thinking her friend on a date

INTO JAPANESE

だからデートで彼女の友達を考えていた

BACK INTO ENGLISH

So I was thinking about her friend on a date

INTO JAPANESE

だからデートで彼女の友達のことを考えていた

BACK INTO ENGLISH

So I was thinking about her friend on a date