My mother had an accident and broke five ribs, what is the best treatment for a full recovery? and how many time does it take to get better?

Takes time: Rib fractures will heal on their own over time, but they are painful. She needs to be encouraged to ambulate and to try to breathe as normally as she can. Pain meds such as Ibuprofen will make it less painful for her to breath deeply. You didn't say how old your mother is, but you want to encourage her to try to stay active. She must avoid developing pneumonia.