My experience about nannies with fake references...
I found a really lovely 23 year old Spanish language student willing to be a part time nanny for me on Gumtree. She claimed she worked for Cuban woman in London for 2 months and gave me a UK mobile phone number. I called up the reference, who was extremely positive, although both the line and the English were bad. I also asked for a ref from Spain but candidate didn't have one, just said she'd try to get one.
To cut a long story short, mainly through Facebook research (it is incredible what people put on FB), I worked out that this girl had never worked for this woman, in fact the woman didn't even have any kids. She was just a friend. The girl eventually admitted to making it all up because she "knew it would be really hard to get a nanny job in the UK without a UK reference" but claimed that everything else she told me was true.
She would probably have been fine as a nanny, but we didn't give her the job. She is probably now looking again in Gumtree, so say hi to her if she applies for your job
Funny thing is, I would have been quite happy if she had only given me Spanish references.