Opti, stop validating her being free to do whatever she wants... she is a MOTHER and a WIFE, she is NOT free, she has commitments and obligations... YOU need to acnowledge those and eduate her... don't tell her she's free to do whatever she likes... you are just enabling her behaviour

WIFE : I have to move out

YOU : You are a mother and have obligations, if you want to destroy those and act reckless, don't expect me to join you... I am going to be an adult... you are welcome to join me

and walk way

something like THAT is much better than

WIFE : I have to move out

YOU : You are free to do whatever you want...

That's just wishy washy and isnt' help ing you