YOU SAID:

My friend ate one of my pencils so I ate her friend

INTO JAPANESE

私の友人は私の鉛筆の1つを食べたので、私は彼女の友人を食べました

BACK INTO ENGLISH

I ate her friend because my friend ate one of my pencils

INTO JAPANESE

私の友達が私の鉛筆を食べたので、私は彼女の友達を食べました

BACK INTO ENGLISH

I ate her friend because my friend ate my pencil

INTO JAPANESE

私の友達が私の鉛筆を食べたので、私は彼女の友達を食べました

BACK INTO ENGLISH

I ate her friend because my friend ate my pencil