They are living animals so no one can guarantee you what will happen in your specific case, but practically all broodies will stay on a nest long enough to hatch turkey eggs which take 4 weeks Most will stay a lot longer than 4 weeks. Many of us wait a week or more to start eggs under a broody just to be sure she is serious about being broody and to gather the eggs.
I woud not have any worries about giving her eggs at this time. I can't give any guarantees, but I very much doubt you will have any problems with her leaving the nest. As far as I'm concerned, she has proven that she really wants to be a Mama and deserves some eggs.
I don't know how to be more positive. Give her the eggs. She'll be fine.