The Filipina pair forced the 19-year-old royal shuttler, a specialist in the doubles who made her debut in the Games, and her partner to a series of outside shots and miscues to fashion out the win in 20 minutes.
But Chiu and Tanco rammed into a talented Vietnam duo of Wong Pei Tty and Chin Eei Hui and lost, 4-15, 3-15, dashing whatever hopes of the hosts for a medal in the event.
The Thai Princess was gracious in defeat.
However, not even the presence of First Gentleman Mike Arroyo could inspire the Filipinos as world-rated mixed doubles partners Kennevic and Kennie Asuncion, who captured the bronze in the last SEAG in Vietnam, likewise took an early exit following a 14-17, 10-15 loss to Thailands Songphol Anukritiyawon and Kunchala Voravicnitchaikul in the last 16.
Kennevic earlier dropped his singles assignment to Poompat Sapkulchananart of Thailand, 4-15, 15-13, 4-15.
Jaime Junio Jr. and Mark Alvin Natividad also failed to reach the quarters as they lost to their counterparts from Singapore, 11-15, 15-10, 8-15, in the mens doubles event.
The RP singles entries Chiu and Paula Obañana likewise failed to advance.