personally I'm not digging this part of the story. From the beginning I thought it was kind of messed up that Marie thinks she has a right to choose who is the crown princess, especially if she is putting in all the effort for Rachel, what makes Rachel qualified enough? This could end up having the opposite effect Marie wants, and Rachel will keep her in the palace to use her talents.
But I think what is really waning my interest is that Marie has a solution for everything lately. I wouldn't wish someone in real life to struggle but since this is a webtoon I'd like it if she encounters more difficulty when coming to a solution. At this point I kind of want her "gift" taken away or at least not give her help to see her achieve something through her own hard work.