Is a woman considered a severer of kinship ties if she does not visit some of her paternal aunts for fear of harming her mother, and if she does not visit her maternal uncle who visits no one and whom she cannot visit alone?

If visiting some relatives causes harm to the mother, then maintaining ties with them can be limited to the extent that does not cause harm. As for the maternal uncle, it is obligatory to maintain ties with him as much as possible, even if it is by contacting him to offer greetings and inquire about his well-being. Maintaining ties is achieved through whatever is conventionally considered a connection, such as visiting, contacting, corresponding, and offering greetings.