Hello, Im sorry you had to undergo one of the complications of a hysterectomy
There is a chance for infection when a foreign body like a tube is in our body,it needs to be changed frequently for this reason. Presently she is suffering from fever
due to this again and your doctor is planning a one time cure for this, when conservative treatment fails, surgical management is the resort, there are other procedures like end to end anastomosis
, intestinal implantation
of ureter etc but I feel your surgeon is the best person to decide on table the best treatment option, bladder flap and ureter repair is a good option, you can go ahead and get this procedure done but understand that any procedure has some inherent risk, go ahead, all the best.