Someone told me the other night Meera Reed couldn't be bounced back to shadows when catelyn stark returned to your hand at the end of the phase. Is that true?

Cheers,

Mooch

FAQ, p. 8

(2.6) End of the Phase
Each end-of-the-phase Framework Action
Window should be played without step
two (Save/Cancel) and without step five
(Responses). No triggered effects can be
played after the initiation of the end of the
phase.

So, with no "Response" step at the end of the phase, Meera's Response cannot be triggered.