YOU SAID:
I would that she had done her homework
INTO JAPANESE
彼女は彼女の宿題を行っていたと思います
BACK INTO ENGLISH
I think she had done her homework
INTO JAPANESE
彼女は彼女の宿題をするいたと思う
BACK INTO ENGLISH
I think she was doing her homework
INTO JAPANESE
彼女は彼女の宿題をやっていたと思う
BACK INTO ENGLISH
I think she was doing her homework
That didn't even make that much sense in English.