Responses
Remember that they do have a mutual agreement, it's not marie's fault for going along with it, and also, she does have an excuse to try and escape, after all her so called "family" (I'm saying it like that coz it seems to me that shje was a bit neglected) died at the hands of the prince, so in no way would she know that he would actually marry her

is marie naive or what?? she is giving her self away by helping anyone especially that blonde bitch, does really think that rachel could have done all that her by herself? she isn't different from ariel, ariel shows she is a bitch but rachel on the other hand is keeping it to herself, both of them are by same. the prince all ready knew that marie helping rachel from the start, I just know that he'll ask rachel how "she" came up with the idea in the next few chapters, and rachel not being able to say where she got that will of course lead to marie.
if everyone forgot, marie is a run away princess, there's really no excuse for her not to be the empress