Michelle was long finished with the Grand Prix at that point. Her last Grand Prix event was 2002 Skate America. (And she didn't want to do that, but the USFSA "made her an offer she couldn't refuse.

)
Edit: As for 2005 Worlds under CoP, her performance wasn't a total bust. She scored 200.19 points in a scoring format that also factored in the qualifying round. She actually got third in both the SP and the LP, but a disastrous qualifying round opened the door for Carolina Kostner to edge her out for the bronze medal with a total score of 200.56.
Of course there was no catching Irina Sltskaya at theat competition, the finest of Irina's career.