How do you know this? Can you provide a link? Has she stated that the White House turned her down, and that this, aside from Bush's policies, made Noonan turn against Bush?
Noonan made a very public the fact that she was resigning her job at the WSJ to volunteer her services as a speech writer to the Bush re-election effort. She went to DC and evidently was turned down, because she was soon back in NY.
You can look it up, she wrote in the WSJ all about it.