From where does this info "appear"❓ Nowhere that I've read or seen...and earlier today I searched extensively. The rule is first violation is a 2 stroke penalty, then an ensuing violation results in DQ. Nowhere could I find that they were warned and assessed the 2-stroke penalty prior to the DQ. If privy to such pertinent info, would be much appreciated if you could provide it. Rather, it seems officials were made aware of multiple violations and she was DQ'd.
The following is excerpted from Golf Monthly...
Vongtaveelap was even par through five holes but was not allowed to continue after USGA officials found that her caddie, Jinsup Kim, had used a rangefinder on multiple occasions.