Twice. The first time she just flew, became invisible and dodged everything (since her opponent couldn't see her), because, according to her, that battle was A-kun's, not hers; the second one she kinda just punched and kicked.
...assuming you're not counting Soga actually being above such silly concepts as age due to being an avatar of TLoI.
All Vessels of TLOI (Vessels, not Avatars) have an average human life span. Literally the only way Keena could access anything from TLOI would be unconsciously, such as on Act 5, when she fainted and turned into TLOI.