What to do about a woman who lying/delusional about having had a baby?

I know this single woman who, almost certainly, is either delusional or has made up an elaborate lie about being pregnant and now claims to have had the baby. And I would tend to think the latter is more likely to be true.

To put this in context, I am a taxi driver and this woman is a regular of ours and she is 40ish. This woman has told my colleagues and I conflicting stories which don't seem to add up. She told most of my colleagues that she was pregnant, but she told me that this was just a rumour that she was pregnant. Then recently she has told everyone, including myself, that she has had the baby, but after about 3-4 weeks she keeps making excuses about why she never has the baby with her. My colleagues tell me that they have witnessed her making apparently fake phones calls to her mum talking about the baby and feeding it and whatnot.

I strongly feel that this woman is in need of psychiatric help, but I'm not sure about how to direct her towards it. Doing so would inevitably mean confronting her about her lies and I'm afraid that might push her over the edge.

Does anyone know if there is a charity or something that would offer advise on such matters?