Veronica is here to make sure people look the part, while also being a chatty noble from their court. A young noblewoman? Most likely. She grew up in upper society, but "upper society New York City" isn't like actual royalty. She is a quick learner and has been assigned to this task by Aizawa anyway so she's in. She's just not there to be a royal, but to be the right hand of a royal, basically.