Threatening the villagers
Yu Dong knew very well that no matter what she does, the villagers would come after her without a doubt. In the beginning, she didn't try to create trouble with them because the previous owner was indeed in the wrong but this time - she wasn't in the wrong! She was the one who knew how to build Kang, and it was up to her to decide whom she wanted to teach. What did they mean by forcefully trying to learn things from her?
She understood that this was the villagers way to teach her a lesson and make her obedient, maybe they thought that now that she has turned for the better, she has become a soft persimmon that they could chew and spit as they wanted! They were trying to push her into a corner by harming her crops so that she would have no choice but to concede to their wills