YOU SAID:
My sister hates going to school
INTO JAPANESE
妹の学校にも行きたがらない
BACK INTO ENGLISH
Do not want to go to my sister's school
INTO JAPANESE
私の妹の学校に行きたくないです。
BACK INTO ENGLISH
I don't want to go to my sister's school.
INTO JAPANESE
私の妹の学校に行きたくないです。
BACK INTO ENGLISH
I don't want to go to my sister's school.
That didn't even make that much sense in English.