“She decided to be stupid”

RORY: [on the phone] Yeah, you too. Bye. [hangs up] That was Lane.
LORELAI: Oh, and what’s the verdict?
RORY: She decided to be stupid and tell her mother the truth – that she wanted to go to a rock concert with us tonight in New York.
LORELAI: Stupid.

In the very last episode, Double Date, Lorelai said she could never lie to Mrs. Kim to help Lane disobey her, citing “the mom code”. Yet now she says that Lane was “stupid” to tell her mother the truth, suggesting she was quite prepared to lie to Mrs. Kim on Lane’s behalf.