Is it possible to manipulate children through the use of Dr. Bach Flowers?

In principle Dr. Bach Flowers cannot be an instrument of manipulation for either adults or children.

Dr. Bach Flowers have an effect only when they are needed.

Because their effect is to strengthen connection to Inner Guidance, those taking Essences are ultimately less subject to manipulation.

Even if Dr. Bach Flowers were to be used to transform a very lively child into one who is better adapted to a situation or environment, the treatment would not be successful because the child’s true nature is lively.

It isn't possible to create an entirely new character trait in a child.