Her reasoning on the subject is that if I was to go to the supermarket and put a bunch of things in the cart, get to the checkout and all of them were malfunctioning I couldn’t just walk out of the store without paying could I.
There is a big difference. In the supermarket, if all checkouts are malfunctioning, you can leave the cart behind and walk away. On CA-125, if the booth is broken, there’s no possibility to back out.