Hey Filicia. How are you doing? Well, I am feeling very happy for you sister. Indeed she has to go to bad time for her baby. But I am sure she will be very happy at the moment because of it. Everything happens for a reason indeed. God has a better plan for his people. Well success rate of IVF depends upon different factors. One of the most important factor because of which most IVF cycle failed is tests. Many IVF patients don’t have the idea that how much their health condition is going to influence their upcoming baby. No doubt it depends on luck. But we have to take good care. Diet is also an important factor in IVF> many women take the wrong diet because of which their IVF cycle fails miserably. Also, mental health is so necessary for IVF. A number of women failed their IVF cycle because they panic too much and took a lot of pressure on it. So I think all these points are very necessary to be kept in mind before going for IVF treatment.