You need to ask to see her previous green contract and a reference letter. I will also check the signature of the reference letter is as the same as the green contract. They are very tricky. They love to tell lies even small things.
Agree with your suggestion, but at that time, no other choices, I was urgently in need for a maid, thought I was sure I was cheated by the maid and the agency. But, no next time. Really waste of time, money, dignity.