While Ashmita beat USA's Jennie Gai 21-16 21-18, Malvika defeated fellow Indian Anupama Upadhyaya 21-18 21-8 in their respective opening round matches.
Top seed Sindhu, a former world champion, took 36 minutes to get the better of 21-year-old Chaliha 21-7 21-18 and set up a last-four clash with Thailand's Supanida Katethong, seeded sixth.
Returning after the Covid break, Ashmita marked the occasion with an impressive display, beating World No 28 Evgeniya Kosetskaya of Russia in straight games ( 24-22, 21-16).
Unseeded Chaliha took just 31 minutes to get the better world number 28 Russian 24-22 21-16, while double Olympic medallist Sindhu cruised past compatriot Sri Krishna Priya Kudaravalli.
As part of the coaching staff from 2011 to 2014, Edwin Iriawan has worked with some of India’s A-list shuttlers, witnessing many ground-breaking results in the process.