Lol what? If she is doing her job as the future duchess at cutting out unnecessary expenses why does that mean she is not allowed to haviea night purely for her and her partner? And come on it's a few roses scattered and a nice outfit, the maids won't have a huge mess and it's literally their job that gets paid very well to do if I got the vibe right with the story. Her being the FL that is humble and has selfish desires to have a romantic night with her partner sounds like just a normal person and I don't see the problem
Flowers don't cost that much. Are you seriously so broke and jobless that you think they do?
Oh no! Not the flowers! How ever will their budget recover..
FL: Lets cut some of these outrageous household expenses. We dont need to act like we're made of money.
Also FL: I'll need a bunch of red roses, I am planning a romantic night of lovemaking and I am sure the maids won't mind cleaning up after I made a completely optional mess.
The problem with these stories is always that the author wants the MC to be humble but also for them to choose to dress like a million bucks and to freely take advantage of servants.