Probably around 1% of USYD's population have red hair. Probably around 30% of USYD's population is Asian. You described yourself in more detail (e.g. height, body type, fashion sense, etc.) She hasn't. You described the locations you go through. She didn't. Therefore, my guess was based on logic and probability. Cosmic Doris' wasn't.
I have just a feeling that tomorrow the Australian dollar will crash to $0.50 US cents, and Australia will completely shut off its borders to all immigrants.
Your 'feeling' was as silly as the above.