Does my prioritizing a Christian female over a Muslim female in conceding a university accommodation — knowing that the final decision rests with the administration — count as aiding a disbeliever against a Muslim and thus falling into one of the nullifiers of faith?

"The abundance of questions about obsessive doubts (waswasah) and the fear of apostasy necessitates turning away from these whispers and not yielding to Satan. Speaking with a non-Muslim is not among the nullifiers of Islam or an act of aiding disbelievers. However, it is more fitting for a Muslim to be keen on benefiting, supporting, and empathizing with their Muslim brother."