M.,
Girls are easier younger, So if you are going to try one important thing is does she wake up dry?
If the answer is yes then she has learned to hold it, this is good and you should but her on the potty when she first wakes up. You can put the little potty in front of the tv so she can sit there and watch tv until she goes. You can't hold morning pee forever. Tell her as soon as she goes she can have breakfast. When they are watching tv they will forget to hold it and she will surprize herself by going. Only make her go first thing in the morning for about a week, by then you will see that she understands the release of her bladder, everyday she will be better at it. So after a week let her pick out her big girl undies, and put them on all day long (NO more diapers or pull-ups).
She knows what she is doing by now but she is still young so you will have to reminder her to try often, watch her drink intake, after eating try an hour or hour and a half till you kind of understand how long it takes her body to process pee. No-one has to go every 20 minutes, but maybe ever hour or so, when you ask her if she has to go, tell her that her tummy will tell her that it's time to go. Ask her in the morning what her tummy thinks, can she feel that it's full, then how does it feel when it's empty. She needs to learn what she is suppost to feel. So she will put this together faster. I wouldn't put pull-ups on her at night unless you know that she pee's during the night.
(she will learn to go in the night diaper before telling you she's awake). The minute you see her in the morning check to see if she is dry, if she is then she's ready. It's hard to catch a during the day pee so you might start by when you change her diaper make her try, My 2nd child was very advanced, she rolled over the day we brought her home, crawled at 4 months, stood accidently in the middle of the floor several times at 6 months didn't take a step until 9 months, but she would see her sister & I using the potty and so I would change her diaper at 18 months and say ok go try the little potty she would and actually go. This saved us on diapers, but I didn't potty train until 2 because she was so little and busy. If you are ok with going slow then try the diaper change first but if you are ready to do this thing then you will have to push a little.
Remember to Praise Praise Praise, Do the whole song and dance thing when she goes, so that she'll see this makes you really happy and she'll want to make you this happy again. Kiss her from head to toe for the great job she did today. We did stickers for the month if they had no accidents for a whole month then they got to pick out a toy at the store. This way they have something to look forward to but not getting something all the time. The praise thing was fun, and that was so exciting that they didn't need all the junk toys, just a good toy for being successful and big. Good luck! J.