For two reasons, first, to make it flow better, make more sense, and involve more characters, and second, to get her on the new art/rigging system, so that she can be used with the new way of coding that is being implemented now that they have a real coder, rather than having it done by the artist.
They are wrong. They game is buggy because the old parts of the game were written in one way, but the rest of the game is being done with 'new code', the new and old code do not play nicely together. The more of the old code that gets replaced, the better we will be, and the closer we get to save compatabilitompatibility.
Hard to say, I barely used the 'hints, what was the last thing you did?