I think you two should've talked about this and really understand where you two are at and where you both want to go in the future. I do think that it's important to take a break if both or one of you are not sure of the future or unclear with feelings for each other because I see you mentioned marriage and most of the time, you don't get to take a "break" without talking about it and being honest with each other if you end up marrying her. Any relationship require constant work for it to last. If you're not sure what she is feeling or where she is going with this "break", I would call her and have an open and honest conversation with her so that you're not sitting around waiting and wondering.