No, mothers do not have control of their children later in their lives. First, children are not blank sheets of paper and they are born with certain wiring, temperament, etc. What mothers and fathers do is guide, coach, love and teach their children to be good citizens, we are not God and do not mold them from scratch. Children have to assume responsibility for their adult life and choices.
As for happiness, it is not my goal for my children. We are not entitled to being happy- it is not a right, it is not
essential like air, water, and food. It is nice if you find happiness but is not something you can guarantee anyone, especially your children. Life is not easy, it is challenging and to set your children up to believe they should be happy all the time will end up being a huge disappointment as it is not realistic.
Lastly to your first part of the question, Bernice actually did use her "astrology & psychic gifts" to manipulate George to find Irene- she did attempt to shape their paths.