How do I get her to be honest?
So I have this friend who I've known for six years and we've always been there for each other. But in the last couple of years I keep catching her lying to me and my three other best friends. The thing is that they aren't little white lies, they're big things that could get people into trouble. The thing is, that when she tells the lie she exhibits every trait of someone who lies but then she swears up and down that she isn't lying. But then about a week later she'll let us know that she was lying. We've confronted her about it but she tells us that she has no idea how to stop lying. She just told me that she would do anything to gain our trust, but all we want is for her to tell us the truth, without embellishing anything. What should we do?