Joshana won 11-9 11-4 11-3 against an error-prone rival in 25 minutes.
"It was a good match. The first game was pretty close, but I managed to close it out in three, so that's always good," said Joshana, ranked 24 in the women's circuit.
National men's champion Harinderpal Sandhu, seeded No. 3, also entered the last eight, but only after surviving a tough five-game contest against England's Joel Hinds.
"It was a seesaw," said Sandhu after his victory.
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"Luckily I was on the high side. I relaxed a bit too much after the first game. In the fifth, I was on top of it from the start and that showed as I got the lead and hung onto it."
Egyptian siblings, Hania and Karim El Hammamy, stormed from the qualifiers into the last eight with wins in today's main draw.
Qualifier Lee Ka Yi upset fifth-seed Deon Saffery of Wales to enter the quarter-finals, while Indian wild card Sachika Ingale went down to Egypt's Nouran El Torky, who carved out a 8-11 11-1 11-2 11-2 win in just 20 minutes.