She should wear a wedding band? Come on!
And what will she do if someone asks her a question about her husband? Make stuff up? and if she gets engaged/married during her time in school? It will become obvious that the whole thing was a charade…and she will have a lot of awkward explaining to do.
This balancing act will continue to be an issue when entering the workforce. You need a way of DEALING with it, not avoiding it!
Each person has to make their own gedarim. It’s possible to be reserved and refined, and still act like a mentsch.