I personally think Whitewing would make a better deputy, as she always struck me as being very helpful and organised, though I've not actually read the third and fourth series (just picked up on the plot through WW) so I don't know whether she has an apprentice during that time ;;
Yep! She's had two, actually. Icecloud (Dustpelt and Ferncloud's daughter) and Dewnose (Cloudtail and Brightheart's son from their second litter), so she's got the qualifications down. She's still just as helpful, organized, and full of amazing wisdom and kindness. She's a good mother too.
Can't quite say the same for Millie… lord, she's way up there on the “cats I dislike” list now. x.x