unless she can quit the club (big doubt after doing this)
even with doing the grade skip each year there's still 2 more years of this club to survive through
so who knows, maybe she'll pull it out at some point
Basically she was thinking through the list of this world's musics to see if there's anything she can use.
There isn't (or at least all the ones she know has been played) so she pulled another world's music.
Because they mentioned growth I felt curious to check
Eva on her first appearance:
https://mangadex.org/chapter/cea76955-e5ca-4a96-802e-884eab4b9055/20
vs this chapter the girl's grown like half a head taller.
It's the same problem as her wanting to refuse being the princess's lady.
Can it be done? Yes.
Can it be done with no issue? Maybe, but just to avoid the risk it's better to go with her whim.
Even if the princess herself somehow allow it, the annoying jealous people around will certainly not...