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Appel_banappel

Alongside @KaizerBiker and @Beach_enjoyer2101 's suggestions, it could be helpful to raise these concerns to other close friends who know this person. Sometimes getting a third-party perspective or just seeing if your gut feeling agrees with others can help gague the situation, especially if they are a frequent liar. And be vigilant towards how this person affects relationships with others, I'm not at all saying this is the case but as an anecdote I had a friend in high school who ended up bulling five of my friends because her lies made it really difficult for us to realise what was really going on until it was too late.

In any case, you sound like you care about this person and how she is doing which is great and hopefully some more open communication can help you figure out what is going on.