YOU SAID:

She doesn't understand how tired I am

INTO JAPANESE

彼女は疲れて理解していません。

BACK INTO ENGLISH

She was tired, had no idea.

INTO JAPANESE

彼女は疲れていたので、考えていた。

BACK INTO ENGLISH

I've been thinking.

INTO JAPANESE

ずっと考えてたが

BACK INTO ENGLISH

I've been thinking.