Hi M.,
I know everyone thinks that 2.5 is too early but it is a great age for her to start. I am a nanny of 6 yrs and have been the head toddler teacher in a daycare for 2 years, one thing I know about is potty training. LOL I believe if they can tell you what they want to eat, drink, and most of all tell you no potty they can comprehend "going potty". The way to actually know if they are ready is if she is using less diapers or sleeping through nap without wetting the daiper, if she is doing that she is certaintly ready.
1. get a potty seat that goes on the big toilet, if she is scared/cries take her to the store with you to pick it out, now they have all the characters on them like Dora or Elmo, she will love that make it as fun as possible.
2. No rewards, no time outs or punishment if she doesn't go. That doesn't work.
2. Don't switch to pull ups or underwear, that will confuse her, stick with what you have.
3. Take a weekend or do it when you can be uninterupted, not have to travel all over and just be home, so she can get a routine for a day or two/three. You have to be committed to it.
4. Don't make her sit on the potty for long periods of time, take her if she doesn't go but sits on the potty, then let her get off.
Here is how to do it:
The best way to train, at home, is to take off diaper and train them without anything on but a shirt. Why? Because at the age of about 22 months they develop the ability to be able to hold thier pee and poppies, and she needs to learn how she feels right before she has to go, that is the best way for her to know.
It also helps you to find out what she does when it's time for her to go, every child does something, some kids go in a corner, so kids won't sit down, some stand on thier tip toes, some start to cry for a diaper, etc.
The most important thing that I do and it works, it to be consistant and take her every 45 to 50 minutes. Why? Because if you do that and keep introducing her to it over and over and you keep interrupting her play or activities she will get to a point when she will just tell you because she won't want to stop what she is doing when she doesn't have to go. She figure I'll just tell you instead of you asking me over and over.
Once you get that down you will know when she has to go but a child is not potty trained when they can't tell you they have to go and you have to constantly tell or take them for them to go. So try not to have playdates at that time, kids tend to forget about the "feeling" when playing with other children. And remember she is learning so there will be accidents, but it is so worth it. i have trained childer that are as young as 1.5 year, honestly, so it is so possible.
NOTE: Sometimes it is easier if you get them to go poopies first, plus it's easier to tell when they need to do that.
If you need any other advice on it let me know.
Hope this helps.
K. B