The fact that its been two months is not my concern. Some women especially if they are nursing may not get their period back for 2 to 6 months (myself included). But do be concerned she's going through pads every couple of minutes. See her doctor asap. Good luck to the new mom!!
I believe this is not very normal. Heavy period after two months of having a baby are a sign that something is wrong with your daughter. You must take her to the doctor and get an immediate checkup as this can be a sign of some infection of uterus.