142, I don't want to see Donna come back in canon either, as it stands I can believe Torchwood contacted her regarding some small matter (since the Doctor didn't seem to bother about telling anyone other than her immediate family that remembering him would be bad) and she had the predicted melt-down but then managed to fight through it. Then she finds Dalek Caan in the Torchwood basement (I didn't see him die, the batshit is NOT dead) and the two of them build a Timeship out of broken bits and head off to have their own wild and wacky adventures across space and time.

If TPTB can't come up with a story that makes me as happy as that one does, then I want them to leave Donna alone!