I think there are many ways for mother-in-law and daughter-in-law to get along well. On the wedding day, my mother-in-law did something you don't understand. Don't take it to heart. After all, there will be a long time in the future, and you can't have conflicts between you because of this. This is a principle that a good wife should abide by. Never quarrel with your mother-in-law on the wedding day. You shouldn't wash your dirty clothes in public. So many people are watching, you should be aware of it.
Human efforts are the decisive factor.
I think many things may be our preconceived ideas. You should look at this problem from the perspective of your mother-in-law. Is it because she is too happy to get carried away? Instead of trying to give her daughter-in-law a scare through this incident, sometimes it is different to look at the problem from another angle. Don't blame your mother-in-law, and don't let this rock the boat.
To say the least, even if my mother-in-law wants to steal the limelight at the wedding, it doesn't mean that she wants to steal it, because the person who catches the eye on the wedding day must be the bride and groom, and you are the protagonist, so the limelight will always be on you. Don't worry about those who don't. My mother-in-law is just so happy. There are many things that are not as complicated as you think. Don't complicate simple things and cause psychological bad feelings between you.
Transposition consideration
A great weakness of human nature is that it likes to pass the buck. They always see the shortcomings of others and fail to see the advantages of others. Therefore, after things happen, they often find fault with each other first. I think this thing may be because you are too sensitive. Do you feel that your mother-in-law is not good, and then you feel that the other party is doing something wrong?