Any ideas why a female friend would constantly lie to me about things for no apparent reason?

i've known her for some time but only notice this behaviour more recently so perhaps i was being lied to earlier and wasn't aware.

but like i'll ask her questions about things and talk to her , often at our local pub. but she isn't honest with me and seems to say one thing to me and something entirely different to someone else which tends to be more truthful.

but not entirely sure why she is doing this towards me , maybe she was doing it to annoy me or didn't like my questions so giving dumb answers , i'm not entirely sure or perhaps she wasn't even aware she was doing and i make her nervous or something

Any ideas why a female friend would constantly lie to me about things for no apparent reason?
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