From what i know the CAB are mainly volunteers with some basic training, and information they refer to.
They are a first point to start with issues and normally chosen as people with plenty of life experience. But like others have said they are not experts on the LAW.
Do seek expert advice and if possible try and ask at least twice to ensure the answer is the same.
From the way you have said it her husband is claiming the allowance so it maybe ok, but there maybe complications due to the fine details.
Such as if the pinay wife was included in the calculating of the allowance.