As was I. She knew the prophesies of Messiah. Gabriel did not say to her not to doubt. He told her not to fear. The Holy Spirit enveloped Miriam. She was full of grace, the chosen vessel to bring God with us into the world. God blessed her and kept her all the days of her life. She was incredibly brave.
At Cana she saw a need. She went to her son for help, fully realizing who He is, God with us. There is a bond between them stronger than death. They are linked by the full power of the Holy Spirit. I would quote you a passage from Isaiah if I could. Perhaps you can imagine it.
Their relationship is the context in the Hebrew idiom he used, which is behind the Greek you have from us without royalties. She knew he would help. I am persuaded she knew He could, and would, do miracles. As the foolish find out, it is difficult to buy oil or wine at a late hour of the wedding, but with God nothing shall be impossible.
Your use of "us" is troubling.