Andy Card has a job to do and she makes his job difficult because of her inabilities and moving her to SCOTUS makes her someone else's problem. He doesn't care what kind of a screw up she is on the Court. Not his problem.
But golly, this would give you guys a two-fer! Not only do you get to dump on Miers, but now Andy Card gets to be trashed as well!
Bah. It's a silly theory, and unworthy of consideration.