If you both agree that there is a problem, and it must be addressed, I would suggest meeting--ironing out short term and long term solutions--and getting back together.
You may have to let her make the personal financial decisions for a while, or something to that effect--but you sound like you know this already.
Anyway-- an open-ended seperation is always worrisome to me. Maybe you could at least agree when you will get back together...
Why the seperation if you agree on the problem? I know there must be times when a seperation is helpful, but I don't see it. I think sometimes, a seperation is either a vacation from marriage, or a subterfuge of one partner, who is thinking about divorce.
This is just my perception. Not particularly about your scenario, but seperation in general.
Anyway. Best wishes.
WELCOME!