Women's gymnastics head coach Peggy Liddick admits her task to select Australia's five-member Commonwealth Games team has been made "ten-fold" harder due to a spate of untimely injuries.

Dual world championship silver medallist Lauren Mitchell and fellow star Emily Little missed this week's national titles in Perth -- which doubled as the Commonwealth Games selection trials -- due to injury.

Liddick all but guaranteed the pair Commonwealth Games selection given their past records, but her job in selecting the remaining three spots was compounded when Beijing Olympian Ashleigh Brennan injured her ankle after day one of the trials.

Brennan, who sat out most of 2009 to concentrate on her studies, was coming second in the trials at the time and will now apply for an injury exemption to have any chance of making the team.

"It doesn't make it easy," Liddick said. "She (Brennan) was a true contender in my eyes as of Thursday.

"The doctors gave us a recommendation that we pull her out.

"It compounds my selection decision making ten-fold."

Beijing Olympian Georgia Benora all but booked her Commonwealth Games place after winning her first national all-round crown on Friday night, while Mary-Anne Monckton did her chances no harm with a second-placed finish. Twenty-year-old Bonora said she was surprised by her national title.

"It feels so strange," Bonora said.

"I never thought I'd be a national champion. I never thought I was that girl.

"I knew some of our strongest girls weren't competing but it was still a surprise.

"I wasn't really focused on the results, I just wanted to stay on the apparatus.

"I didn't compete to the best of my ability out there but I'm still improving.

"I have a lot of upgrades to add on vault and floor, and I need to clean up my bars and beam.

"It would be so exciting to go to the Commonwealth Games."

Liddick praised the efforts of Monckton, who appears set to join Little, Mitchell and Bonora in the Commonwealth Games team.

"She's finally healthy enough to have an uninterrupted training period to produce these results," Liddick said.

Shona Morgan finished a disappointing third in Friday's all-round final and looks set for a fight with Brennan for the final Commonwealth Games berth.

Beijing Olympic rhythmic gymnast Naazmi Johnston is a certainty for India after taking out her third straight national rhythmic all-around title on Friday night.

Justin Chadwick
AAP