My mother-in-law sent a divorce message to her daughter-in-law, but she didn't reply.

First of all, you two are in the divorce stage. Moreover, divorce can't be achieved overnight. Although if you two send your marriage certificates back to your hometown, 1 time for divorce, the court won't decide, but he will mediate, which can make you two adapt again in a period of time.

If 1 adjustment doesn't work, and you two still insist on divorce, then the second judgment will be accepted.

According to your description, you two just got married 10 days, so there shouldn't be much contradiction. But this matter is caused by his mother, so you should discuss it with him. You can tell each other what you think. After all, you two got married voluntarily. And you haven't done anything wrong to him, so you two will grow old together in the future. And it's unfair to you that his mother did this, because you are so filial to your parents and so good to your husband, and you shouldn't be treated like this.