I mean most of us have self-diagnosed our selves a little bit before we head to the doctor no ? and it doesnt matter what sickness it is, the google result will always lead to cancer lol . Then we panicked and head to the doctor is what I assumed most people do .
tbf we all prolly diagnosed ourselves whenever we feel something unusual in our body also not to mention iirc her father(?) is a doctor or something alike cant remember well so i guess she got that self diagnosis from growing up