how do you know they are lies?
are you just assuming because they sound a bit odd?
I used to have a friend, 10 years younger than me, who i later found out didn't believe some of what i said.
she never said anything, she would just smile and joke along or whatever.
i realised when i told her of a song called 'gordon is a moron' (its actually by jilted john and has another name) but anyway she just laughed and smiled and when i turned to an older guy and asked if he remembered it, when he said yes, she was suddenly really shocked.
she hadn't believed a word.
I really like unusual bits of information and odd things, especially if they will make people laugh, so i am inclined to remember useless but interesting facts.
seemed all this time she thought i was just making stuff up for a joke
we are no longer mates
i told a guy once that i had read that they had been considering starting to bury coffins upright, to save space in the crowded cemetarys (not sure where now) - he got annoyed and said i'd made it up - but i really did read it somewhere!! whether it ever happened i don;t know.
could there be an element of this in your friend? that what she says is mostly true, but just sounds far fetched?