Last night, I offended my mother and made her cry. I called her today and ignored me. What should I do?

It doesn't matter. You can find an opportunity to have a good communication with your mother, find out the key points of the problem, and then talk openly. Everyone is responsible for such a thing. The important thing is to let go of the burden in your heart, talk seriously and tell the unhappiness of both sides. In this case, aren't all the problems solved?