Qasam on The Holy Quran

Assalam o Alikum I have a question if you please answer : If someone put hand on The Holy Quran and take a qasam/promise to do something or not todo something without any pressure and in full senses then can that person later if want to do that thing can that person do a kafara ? Or there is no way to change this and it’s locked ? A lady has took a kasam on The Holy Quran not to marry someone and now she wants to, what will be the kaffara? Many thanks Ali