YOU SAID:
I went to the mall to pick up my niece from my creepy friend.
INTO JAPANESE
私は私のぞっとする友人から姪を迎えるためにモールに行きました。
BACK INTO ENGLISH
I went to the mall to greet my niece from my frightening friend.
INTO JAPANESE
私は怖い友人から姪を迎えるためにモールに行きました。
BACK INTO ENGLISH
I went to the mall to greet my niece from a scary friend.
INTO JAPANESE
私は怖い友人から私の姪を迎えるためにモールに行きました。
BACK INTO ENGLISH
I went to the mall to greet my niece from a scary friend.
That didn't even make that much sense in English.