L., my son is only 2 yrs 9 months, plus with his being a boy he's a bit more behind your daughter probably, but he's doing the exact same thing. as long as i take him like clockwork (and with him it's like every 20 minutes or i miss it) he goes like a champ "on command", but he has yet to tell me he "has" to go...only "I'M SORRY!" when he HAS gone. he is also very smart and i am pretty confidant that he knows what he's supposed to do - in his case, we have only started hardcore training the last few days so i hope he'll get it. but one thing i have noticed is that when i am disappointed or frustrated, he often "wants to go" more. and i know why - when he is "trying" i sit next to him on the tub and we talk, sing songs, read books, etc. is it possible she's feeling jealousy over the daycare kids and wants that extra attention? just a thought...i don't know how to fix it either but i guess we just keep plugging along. they have to get it eventually right? a dr. could tell you if she is having any problems "down there" i suppose...good luck!
for what it's worth, we have not used pullups at all while training...he still uses a diaper for the most part, we're just "starting"....but he DEFINTELY knows when he's gone in his underwear, so i'm happy with what they're doing so far. i've been told that some kids don't even realize they've gone in a pullup.
PS, my hubby is also looking to get into the truck driving industry, i'd love to hear your story - i am expecting the long absences, but i hope that the stability for our family will make up for it. did your hubby do the training with the year contract thing? email me if you want!