Classic, clean lines, neat, tailored, can be preppy, in part where preppy means sporty, athletic (stilettos would not qualify) ; simple shiny-clean hair and mimimal or very natural makeup.
Not ALGO, not Boho, not Dramatic.
So your button down shirt tucked in and fairly classic outfit + great fresh-faced Angie look does bring that to mind.
I certainly don't think that style descriptor has to indicate lack of style or frozen style, though--just as in any "category" the person can look very modern and stylish.