She was in their Psi-Division, so might have had less than a standard STRIKE or SHIELD agent (Mentallo was never what you'd call kick-ass)
Plus I meant to add that I wouldn't be sure that "Didn't manage to beat Sabretooth" should really indicate you were a poor fighter, since I'm not sure a significantly large percentile of the population COULD beat him. And her psi-powers made her formidable enough in most situations.