YOU SAID:

i tried to help my mom with the washing up but she'd already finished when i had gotten home that day.

INTO JAPANESE

お母さんの洗い物を手伝おうとしたのですが、その日家に帰ったらお母さんはもう終わっていました。

BACK INTO ENGLISH

I tried to help my mom wash her, but when I got home that day, she was already done.

INTO JAPANESE

私は母が彼女を洗うのを手伝おうとしました、しかし私がその日家に帰ったとき、彼女はすでに終わっていました。

BACK INTO ENGLISH

I tried to help my mother wash her, but when I got home that day she was already over.

INTO JAPANESE

私は母が彼女を洗うのを手伝おうとしました、しかし私がその日家に帰ったとき、彼女はすでに終わっていました。

BACK INTO ENGLISH

I tried to help my mother wash her, but when I got home that day she was already over.