What should my mother do if she always prefers to believe a liar rather than her own family?

I think she cares too much about her health. Many old people are like this. They pay special attention to health problems. When they see that there is something wrong with others, they think they may have it, so they take medicine and see doctors indiscriminately.

First of all, you should make her feel healthy and not sick, so that she won't take any more medicine. If she is really unwell, she should also be taken to a regular hospital.

If your mother has been like this for a long time, always saying that she is ill and taking medicine everywhere, then she is probably hypochondriac, that is, she thinks she is sick when she is not sick, and no one will believe her. Such problems are often stimulated by the illness and death of people around them, thinking that they may be like this. Need psychological counseling to help adjust.