That’s the problem with liars, they need to have an excellent memoryI noticed that. It's really crappy for the people that follow her and care about what she says - she obviously has no respect for them whatsoever. And clearly thinks they haven't got a braincell between them and won't notice her stupid lies.
Alternatively, she genuinely forgot the story she told (I seem to remember she said she was hungover the morning after). That by no means makes it better, of course.