How would you feel if your friend was a potential pathological liar?

If it is your close friend it IS your business; and yes she has issues, most likely with self worth(a lot of young wanna be preggers do),judgment or maybe even denial. It's up to you to either 1.stay her friend and talk to her about it like a friend should or 2.stay her friend and forget it but not trust and believe everything she says or 3.just forget her and tell her you don't trust her move along.