Never quarrel with her, because she will definitely complain to your husband, and your husband will definitely stand on her side, which will make the situation at home worse. If she deliberately makes trouble, tell your husband gently, and don't judge her unreasonable and useless in front of your husband. Your husband won't listen, but your gentle and implicit words will make him believe that he can distinguish right from wrong. Besides, your husband knows her own sister's shortcomings. In this case, your husband also thinks you are considerate, and his pity for you will increase day by day. In fact, under such circumstances, your husband is the most difficult to do. He should take care of you and her sister. Zhou Xuan is between two women, both of whom are his closest relatives. It's hard to give him some understanding.
I don't know why your sister-in-law doesn't look for a job. Just lazy? It's hard to understand. You can be emotional about your husband and sister-in-law. She will always be independent in the future. You can't keep her forever. Help her find a suitable job. I think it would be much better if she worked. Then she will have reason to move out, move to the workers' dormitory or find a place nearby for her to live. In the meantime, you may need some "investment", but in order to let her move out.
Since your salary is so high, you should have considered buying a house long ago. You can often describe the beautiful life after buying a house with your husband, or you can use the next generation to suppress him. What men can't resist most is a woman's gentle offensive. If you buy a house, you must need a loan. In this way, under the pressure of life, your husband is the pillar of the family, and he will definitely converge a lot. Moreover, even if your sister-in-law reaches out to you again, she won't get the money. Besides, she is 25 years old and graduated from college. She has hands and feet and will never starve to death. When looking for a husband, be sure to give her a feeling that you accidentally mentioned. Treating your sister like this now is actually hurting her and will be a wife in the future. I'm sure I'll live such a hard life. For her sake, she should be independent as soon as possible, otherwise she will blame you later, and I think your husband will analyze it himself.
Never consider divorce. Divorce for my sister-in-law is really not worth it. You must never move out by yourself. In this way, your husband will think that you are too narrow-minded, and your love for you will gradually fade over time. I think you are bound together because of love, and nothing can't be solved. As long as there is love between you, be kind to your husband, be more considerate and careful, and do what you like. Let your husband's love for you deepen day by day, and he will naturally analyze your words a little more, and his feelings for your sister-in-law will also tilt to your side. For example, you can often go to a restaurant to have a candlelight dinner to create a romantic atmosphere, or take a trip for two. Of course, I believe you must have a reason to get rid of your sister-in-law, only when you are alone and in a good mood.
I don't know if it will help you to say so much. I wish you happiness!