Pathological pregnancy?

Completely sorry if I can't post this here, but I have a friend who likes to exaggerate and falsify things. 
She has had "pregnancies" and "miscarriages" before. 
She has lied about having three different types of cancer. 
And told my best friend "she wants a baby so bad" when she's posting that she's pregnant and stuff. 
She will not show pictures of sonograms, and has lied about having a job as well. 
Do you know someone like this? What's the best way to handle this fragile situation. 

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