That's not how it works. She's loyal to her kingdom, the queen, the FL sister. Her feelings and FL feelings do not matter in politics. Historical wise this is a very common practice. It's normal, and they both know it. Going against it is considered treason. Country comes first, and their feelings might come second or third or even lower than that. Being born a noble comes with the responsibility of putting your country and the people first. The maid is a great one. She cares for her master, the FL and is very food at her responsibilities but she's also very good at maintaining her job with is keep the FL in check. The FL is there to create political relationship to benefit her country. This is the duty of a noble. Being born in wealth comes with one shortcoming which is you have everything but the choice who you marry.
The maid really is her biggest opp, literally running to report her every actions to the home country, she doesn’t care about the FLs feelings at all.
She’s been forced to half-marry some random guy that oppressed her country at age 14, and this maid is trying to force her on him. He doesn’t even want to sleep with any of them so stressing the FL out doesnt help the situation.
Also the “I cannot submit false reports”, she is clearly not on the FLs side at all, she would probably throw her under the bus in any bad situation. The maid has been with the FL for almost a decade in a foreign country, and there’s no loyalty built yet???