Lime, no need for English Test.
If you can provide 6 months bank statements so much the better.
Important is that you can demonstrate cash flow and support for the duration.
Next important is reason to return
If she has no bank account in her own or joint names then sorry to say it cuts no mustard with the UKBA, but....... mention in your sponsor letter with statement details in the application. Just to influence really more than anything.
Don't underestimate the need to show reasons to return to Pinas from UK.
Best of luck
