This reminds me of my best friend/neighbor when I was little. She used to lie about the craziest and dumbest shit, like being allergic to milk. Even when caught red handed, would still deny everything.
To me it sounds like a few things. The first being, you are obviously "man" of the house, so she could be consciously or unconsciously wanting some sort of discipline, if she isn't getting enough from her mother or a father. Which is of course negative attention because she's trying to fill a void she has.
I think you are correct with the power/control issue. When she takes no responsibility for her actions, then she is basically doing what she wants on her terms and doesn't have to answer to anyone. Unfortunately she's almost 18 and her mother had to start enforcing these types of things much earlier, because they say the same sex parent/role model has the biggest impact on who you grow up to be.
Sometimes habitual liars are just ashamed of who they are and have convinced themselves that they couldn't have done something wrong, so they don't admit things they have done. She may deny things to you and she might also be in denial herself.
It can be anything or more than one thing. It's habitual because that's exactly what it is... a bad habit and sometimes it's easier to lie than to tell the truth. Like any bad habit, it has to have a consequence. For whatever reason, she believes it's ok to lie... even about minor things because small lies are easy to get away with and if she can lie to her own family, she can get away with lying to complete strangers, who would never know the difference. Minor lies (which I think are worse than big lies because when it becomes so frequent, you never know when to trust someone as opposed to someone that lies rarely) ...she needs to face the reprecussions at some point. It won't be easy to get through to her at her age, but the first thing to do will have to be to find out what's going on inside her mind, not just about lying but about life in general.
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