I love my girlfriend but she tells made-up stories?

Sometimes to find something to talk about, she makes up stories, telling things that supposedly happened to her but actually didn’t - like seeing a UFO, a mysterious man appearing in the garden during a girls' night, an old lady telling her years ago to buy Bitcoin etc. These are clearly fake stories, and I pretend to believe them so as not to hurt her, because I know she does it just to have conversation topics. But now I'm tired of it, and yesterday I jokingly told her that her imagination is really wide. She wasn't expecting that response, but at least she didn't try to justify her lies. It's still bothering me - even if it's well-intentioned, is this a red flag?

I love my girlfriend but she tells made-up stories?
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