PT ?..advice needed

I have been putting DD in underwear during the day (actually it's the gerber training pants, a little thicker than underwear) and take her to the potty periodically throughout the day.  She'll always sit, but not always go, but she has only had two accidents in the underwear in the 3 days she was wearing them.  Today she's in pull ups because she's at daycare and I wasn't sure if they'd let her come in underwear but they said it's ok so starting next week she'll start wearing them there as well (she only goes 2 days a week).  My question is, when will she start telling me she has to go pee instead of me having to keep asking and taking her?  If she's not telling me, does that mean she just hasn't figured out yet the sensation of when she has to go?  She's been peeing on the potty for months now, over the summer she decided to wanted to try it, but again, it's always been me telling her to go.  She was in pull ups so I was thinking that may be why she never told me she had to go, it was just as easy to go in the "diaper".  So how do I get her to tell me when she needs to go?

Also, any advice how to get her to poop on the potty?  She had 2 poop accidents in her underwear. She's only pooped on the potty one time, when my parents were watching her and she was so proud that she did, saved it for me to see, etc. but the next day I caught her pooping in her pull up and rushed her to the potty but she wouldn't go there.  I tried again when I saw her pooping again but again, she wouldn't go on the potty.  Then she started hiding to poop so I thought I'd let it go for a while; but now with her being in underwear, I'd like to try to get her to go on the potty.