I obviously cannot judge you, but what can you do to save more money? being on your salary you should not be looking for credit card loans just to get you by. I would take Peter's advice and let your wife go back to Phils while a, you sort out your money troubles and b, get her spouse visa applied for with no missing or false details or documentation.
I think she (your wife) knew that she was on a sticky wicket and to be honest should not have overstayed, this will be a problem I feel, but with honesty in your application you may get lucky.

I do wish you luck, you have a few hills to climb together, but it will be worth it.