Is it considered a severance of kinship ties to distance oneself from an abusive sister-in-law who causes problems and insists on being present when visiting the husband's family, especially with attempts to limit encounters with her to the bare minimum and in the presence of the mother, while the husband's family demands a strengthening of the relationship between their daughter and her paternal aunt?

If the woman mentioned is harmful and causes discord, then there is no blame upon you for avoiding her and protecting your daughter from her corrupting influence. Do not heed your husband's family's desire for your daughter to be with her. You are responsible for safeguarding your daughter from sources of corruption.

There is no bond of kinship between you and your husband's family unless you are a close relative to them. And if your daughter is below the age of accountability, she is not obligated to maintain kinship ties with her, even if she is being trained to do so in a way that does not lead to her corruption.

If your husband is aware of the true nature of his sister's conduct, then his sympathy for her is misplaced, and he should not condone her bad actions. She should be treated kindly and advised in a gentle manner by someone whose influence is hoped for, and prayers should be made for her well-being and righteousness.