That's wild
In my early 20s, one girl I met a bar, we went on a couple dates, she seemed cool, we had fun, slept together. I went away on a two week vacation after that, it got kind of strange then because she sent me like 4-5 emails a day, mostly about "our love" and the future we had together, and so on and so forth, so I figured not responding and ignoring this crazy girl was the best way to go about things and end it with silence.
Turns out she had her friend help her break into my apartment while I was away, she moved herself and her cat and all her shit in, and was living there when I arrived. She was "surprising me, had this fancy dinner made and the place all cleaned spotless, so I felt kind of bad telling her she was psychotic and to get out of my place. Surreal experience. Made me quite cautious about bringing girls from the bar back to my place after that.