Maytag does still have 2000 gold left at this point, since she only bought in for 1000. In a normal poker game, you aren't allowed to put more chips on the table in the middle of a hand.
They both share the pair of kings so the kings do sort of "cancel out," unless one of them had a smaller 2 pair in which case the kings would counterfit that two pair. (So if someone had 8's and 3's, the 3's would be counterfitted by the Kings and they would instead have King's and 8's.) Maytag announces "ace high" because she only has the kings on the board, so essentially all she has is an Ace kicker. If Galdur has any pair other than the Kings, he wins.
Also, if any of you have watched poker on TV before, you may be more used to watching tournaments. This game is a cash game, which means the blinds don't raise, which means there's no hurry to win all the money. So in this sort of game, a large bet on the river is normally a much bigger deal, and almost always means a very strong hand. Although at the high levels of internet poker, everyone plays aggressively all the time, so you never know.
And yes, those are anti-cheating devices in the room. I'll just go ahead and tell you that there isn't any cheating going on in this game, just so you know.