What is the reason for my client’s relationship with her son to be so difficult?

This is, in fact, karma because you have had strained relations in other lifetimes. He, in fact, has been her father in a past life, but was harsh and judgmental because of quite different vibrations and past histories as well. The two have clashed in multiple lifetimes through the years. So this was intended by the Law of Karma to be a cooling off period when he came in as a child of hers, rather than to have the dominant position chronologically, or for them to meet as adult equals, in order to help her have the greater influence as a source of healing and reassurance, to help restore better balance to the relationship through the application of nurturing. As you can see from her description, this has been a rocky road, so to speak, but that does not mean things are not being accomplished or progress not made. Things are evolving due to her efforts as well as his cooperation, up to a point. With your help, the karmic repair will extend more deeply and more productively, and that will be a good thing. It may take quite some time to rework the long-standing history here, but the point is, it will be underway and we will be working on this behind the scenes for the benefit of them both. Having done her best, there is no reason for her to sacrifice herself, or happiness, to suit her son. In actuality, that would be giving in to the bad blood and allowing it to rule. Sometimes, it is better to simply withdraw from the field of battle rather than to continue the skirmish and incur greater wounding or karmic penalties from making a misstep and worsening things. So we are optimistic here that gains can be made and progress as well. There is still time for there to be a greater reconciliation, subsequent to further healing being put in place. So time will tell.