Complan is more or less sugar with supposedly some vitamins in it. MIL has this for breakfast rather than cereal. It doesn't half mess her blood sugars up though (Type 2). We used to warn her about it.
Might be worth a juicer - you can then pop in what she feels like, got to be better than complan. We've got a Breville Blend Active - only £20 and comes with two drinks bottles. It basically blends the food in the bottle, remove from base, tip over and take the blender top off and put on a drink top. Zero mess. My wife uses it for making fruit drinks when not feeling too good.