How do I handle a friend pretending to be pregnant?

So a friend of ours who we fell out with a few months back due to her stalking my husband and trying to come on to him :/ text us a couple of weeks ago telling us she was pregnant and alone she said her family would no longer talk to her because it was with a one night stand so we said we would be there for her. She tried calling my husband every day she is very in love with him. I bumped into her sister last week and she told me her sister has a history of pretending to be pregnant and her family know nothing of the pregnancy. And all of a sudden today she just text to say she lost the baby. I don't know what to say to her I don't want to give her sympathy if it was something to get my husbands attention I just don't know what to say she is calling my husband now crying saying she needs him to come be there for her ( she didn't know I was listening) it's creeping us both out a lot. What do I do? She knows my husband wants a baby but we are struggling to conceive :( I'm a nice person and feel kind of sorry for her I know she struggles with a lot of issues and don't want to hurt her