If your sister is in debt because of her carelessness or other reasons, and she has the ability to repay it herself, then you can consider helping. In this case, you can first understand your sister's debt situation and her repayment plan, and then give some economic and spiritual support, such as providing some funds to help her make a repayment plan. But at the same time, we should be careful not to sacrifice ourselves too much, and decide the specific ways to help according to our economic ability and living conditions.
On the other hand, if my sister's debt situation is serious and she is unable to repay her debt, then as relatives, we can give emotional support and comfort, but don't take on her debt easily. In this case, sisters should be encouraged to seek professional help, such as negotiating debts with banks or legal institutions and filing for bankruptcy. At the same time, it can also help my sister plan her future, such as helping her find a job or other sources of income and helping her tide over the difficulties.
In a word, as relatives, we can give our sister some support and help, but it depends on the specific situation and we can't easily bear her debts.