My DD didn't train until 3.5. She had ZERO interest before then. She would go in the morning and before bed, for a while, then she refused. When I startedt o get more anxious about it she got more stubborn. This is one of the few things the children can control, so you really cannot force it. I wish I had trained my DD much younger, I think if you can get them during the little window around 18-20 mos it can go well, but if you miss it, then you make it more difficult.
I told DD we weren't buying anymore diapers after the box was gone and she strongly disagreed with me, but I didn't say anymore about it. Then I bought princess underwear for her, which she loved and told her she could wear them when she was willing to use the potty consistently. Then about a week later she told me we weren't going to buy anymore diapers and she started asking to use the potty. So we started using it. I put her potty in front of the tv (we don't use a lot of tv) at the time when she usually pooped and just let her sit there and watch until she did it. So she figured out it wasn't scary, it worked fine and that was that. She only had an accident or 2 after that and it was all underwear.
I think training pants are counter productive. They are confusing. My DH had bought some for DD but they feel the same as diapers and take away the feeling of being wet. Once I took all pressure off about it, just informed DD it was diapers or underwear, she then made the decision to do it and she did it.
DD is very smart. Peer pressure did not work at all with her. We read books about pottying and talked about all her friends older and younger who used the potty, she saw others going to the bathroom. She could not have cared less. We don't do rewards for behavior modification here so didn't consider stickers or candy, and I think that works better with the younger ones anyway. So I guess the jist of this is that you can provide the opportunity for her to go but until she is ready you cannot force it. And at that age, the more of an issue you make of it, the more she is likely to exert her independence and fight you. Do whatever you can to lessen the pressure on yourself about it and she will get there when she's ready.