I also have not had any engines that used that much oil but that doesn’t mean that is unacceptable. We have no idea how this engine was treated before the OP got the car but we have a hint how the OP’s daughter maintains it. At this point, solving the problem is likely more expensive than the car is worth.
As for “Says who” well, these folks;
http://www.aa1car.com/library/oil_consumption.htm
Most of the poster here agree, except you, of course;
And in critical article, BMW says 1 qt in 750 miles is OK…