Dear New Member~
Welcome here to the Forum, a good place to look as others may have had similar unhappy experiences.
I guess I could not give any real thoughts without knowing more, and maybe you are stuck in the same way. I'm not a doctor, just a parent (a while ago now) and had to try to reconcile teenagers desire to be in charge of themselves, have privacy and in many ways the same freedom as adults.
Perhaps there are three reasons for lies, I've just mentioned one, another can be a feeling they should always get their way, and lie to get it, and in the process learning what buttons to press. Perhaps having a feeling of entitlement and little empathy for those they try to fool
Another reason can be a feeling of lack within themselves and try to seem more important as a result.
I'm sure there must be more reasons but that's all I can think of at the moment. All seem to be a method of coping - though wiht different things, and a learned procedure developing over time. I doubt there will be a quick fix (sorry to be blunt) and it may well be that the method of dealing with each is not the same.
Can I ask if you have someone you can talk this over with and gain another opinion and perhaps fresh perspective? If not I'd suggest you start with some counseling to give you support, after all you are in a very difficult and worrying position. A clinical viewpoint might be helpful too
You did say it stated with a phone and went on unto it could harm others, do you think you could say more about that. For example is she accusing others of doing something untoward?
I'm not sure an abrupt action, or a punitive one, maybe taking her phone away, is going to do much good. Building barriers in yourself and not accept lies even though you recognize them might be better . Rahter than argue just more gently acknowledge that they are not the truth and they will not influence whatever you had planned to do.
For whatever reason the longer it goes the more entrench it it becomes until others apart from yourself, adults and her friends realise waht she is doing, a lonely life.
If you felt you could come back and say more that would be welcome
Croix
