YOU SAID:
she was ill when she went to her brother's best friend's dads graduation party
INTO JAPANESE
兄の親友の父親の卒業パーティーに行ったとき、彼女は病気だった
BACK INTO ENGLISH
She was sick when she went to her brother's best friend's father's graduation party.
INTO JAPANESE
兄の親友の父親の卒業パーティーに行ったとき、彼女は体調が悪かった。
BACK INTO ENGLISH
She was not feeling well when she went to her brother's best friend's father's graduation party.
INTO JAPANESE
兄の親友の父親の卒業パーティーに行ったとき、彼女は体調が優れませんでした。
BACK INTO ENGLISH
She wasn't feeling well when she went to her brother's best friend's father's graduation party.
INTO JAPANESE
兄の親友の父親の卒業パーティーに行ったとき、彼女は気分が優れませんでした。
BACK INTO ENGLISH
She wasn't feeling well when she went to her brother's best friend's father's graduation party.
That didn't even make that much sense in English.