How to convince each other if the constellations are not harmonious?

Then you can buy her a so-called amulet and tell her that she has hired an expert to do it, which can break all the disharmony and tie the knot of empathy. If she really believes these things, she will believe what you say. If she doubts what you say, why do you believe her decision because the eight characters don't match? That's just an excuse.