short answer: if it's an actual autoflower, then "no", as the start of flowering is not induced by the light-cycle, like it is with photoperiodic plants, but simply by time..
the long answer: most ruderalis are rather short plants, have little yield and are low on thc, so most breeders only want the time-based genetics, and none of the others to take effect. To get higher yielding and more potent plants to become autoflowers they have to be bread other strains with a ruderalis, but given the way genetics work, it can take quite a few generations until the right traits are being fully developed.. but even then it's not necessary that all of the seeds will be actual autoflowers.
in case your plant however did already start flowering at a longer light-schedule (i.e. 18/6), then the autoflower traits are definitely within her genes, and then she's definitely an autoflower..