So to get this straight.
The only yellow ingredient that is in the first slot it's Honey. You can mix Honey with almost everything, but if you were to go with the yellow keywords it should be either Milk, because she states Milk Powder or it's Cinnamon, it's either Milk + Cinnamon or just Milk + Honey. Then for the second part, sweet and brown points towards chocolate, since the 3-4-5 have to share everything it's either everything chocolate related or strawberry (since also that one brings you to the stroking ending.) So the 5th extra ingredient, the only blue thing it's blueberry, but adding those seem to not do anything. Honestly, I don't get it how you are supposed to go into this 4th ending.