You don't want her to ruin you financially so my advice is to get a legal separation prepared so that you are protected as much as possible. I don't know your financial situation but in my world I needed to get it done so I could make sure my kid was provided for and to force her to start paying her share of the expenses.
You need to look after yourself.
That's my fear, that she leaves with no thought or concern of financials. I doubt she'd think of anything other than what she wants.
