2 On the third day a wedding took place at Cana in Galilee. Jesus’ mother was there, 2 and Jesus and his disciples had also been invited to the wedding. 3 When the wine was gone, Jesus’ mother said to him, “They have no more wine.”
4 “Woman,[a] why do you involve me?” Jesus replied. “My hour has not yet come.”
5 His mother said to the servants, “Do whatever he tells you.”
6 Nearby stood six stone water jars, the kind used by the Jews for ceremonial washing, each holding from twenty to thirty gallons.[b]
7 Jesus said to the servants, “Fill the jars with water”; so they filled them to the brim.
8 Then he told them, “Now draw some out and take it to the master of the banquet.”
They did so, 9 and the master of the banquet tasted the water that had been turned into wine. He did not realize where it had come from, though the servants who had drawn the water knew. Then he called the bridegroom aside 10 and said, “Everyone brings out the choice wine first and then the cheaper wine after the guests have had too much to drink; but you have saved the best till now.”
11 What Jesus did here in Cana of Galilee was the first of the signs through which he revealed his glory; and his disciples believed in him.
“Woman, why do you involve me? My hour has not yet come.”
Is there a generally accepted explanation of this line? Mary somehow knows he has superpowers long before Jesus starts the cult/religion (despite the obvious problems between them concerning the 'virgin birth' myth) - and the first test of a God on Earth is his mom looking at the empty wine cup and saying "can't you fix this with your magic?"!
Were they like, regularly making magic water-wine in the house before she and her son went to the party, or - how would she know?
John is sort of a weird gospel because it was written independently of the other three.
Typically it's assumed that Mark is oldest of the gospels and written independently. Matthew and Luke are both based on Mark. John, however, remains its own thing and was also written independently, potentially by multiple authors at different times. John was also originally written in Greek and not a translation, as it does wordplay that only works in Greek (see John 3, which makes no sense in English or Aramaic but has a double meaning in Greek).
One of the ways John is so different from the others is because John plays up the supernatural aspects a bit more. In John, Mary absolutely knows about Jesus' powers and basically begs Jesus to "blow his cover" as it were, to allow the wedding to save face.
It's implied that Mary has always known about Jesus' "special powers", especially in John. Mark is much more "down-to-earth" when it comes to describing Jesus' powers, while Matthew and Luke (as mentioned) copy Mark and add embellishments (the virgin birth, describing the resurrection). Matthew and Luke give Jesus magic powers that he "should" have, whereas John is very explicit about "yeah this is God and he has God powers" in ways the others do not.
Side note: John is also weird in that Mary and Joseph are basically described as Jesus' parents. Mary is never mentioned by name, and the virgin birth is never stated. In John, Joseph is also explicitly said to be Jesus' father, despite, you know... the rest of the New Testament saying he wasn't. So John is just strange.