Yeah gorl, fight for yo rights!
I love this sentence.
Why not wife?
It is unlikely to be understood that way. If you want to say "She is my wife,..." you would use "Je to moje žena,...".
What is the difference between stroj and mašina?
There is some discussion at https://forum.duolingo.com/comment/24366894/%C4%8C%C3%AD-je-ta-ma%C5%A1ina and in some other threads.