Danila, 23, timed in two minutes and 10.44 seconds to add to her early victories in the 100-m freestyle, 200-m and 100-m backstroke.
Danila, a veteran of four SEAG meets, bested teenagers Marichi Gandionco (2:11.41) and Nikki Santiago (2:14.60) in the five-day meet being staged by the Philippine Amateur Swimming Association for the selection of RP team members seeing action in the biennial meet.
But the day belonged to teen sensation Denjylie Cordero and Bonus Bordado.
Cordero, who just turned 13 years old last week, created the biggest splash by shocking Olympian Jenny Rose Guerrero in the 200-m breaststroke with a time of 2:42.94 in a feat that impressed swimming chief Mark Joseph.
"Thats the future right there, shes sensational," said Joseph of Cordero, who was part of the RP team that trained in China for three months last July.
Corderos time, however, was 10 seconds slower than Fil-Am Jackie Pangilinans. Pangilinan, currently in the United States, has already clinched one of the two slots in the event.
"But theres a chance she might get the other slot, well see," said Joseph, who is expected to come up with the final SEAG roster next month.
Bordado, for his part, also sent shockwaves down the pool by stunning 2004 Athens Olympiad veteran Timmy Chua with a time of 2:25.12 against the latters 2:26.03.
Other Day 4 winners were Ronald Guiriba (50-m freestyle) and Kevin Lua (200-m breaststroke).