Has she tried mixing her Metabolic Drive with water and ice in a blender? She could even try half water and half skim milk with ice in the blender and it's like drinking a milk shake.
Also, I like to use vanilla Metabolic Drive and then I add a drop of a flavored extract to make it any flavor I want.......raspberry, caramel, orange, root beer, peppermint, chocolate, Danish pastry, almond, etc........or you can mix two flavors and have chocolate-mint, Almond Joy (almond, coconut, chocolate), butter-rum, etc. http://www.sneakykitchen.com/watkins/watkins_products/extracts.htm
If she's trying to lose weight, I wouldn't recommend her mixing it with orange juice.