Look, I'm absolutely no expert on TT as my DD wasn't trained until 3.5 and even now she has accidents.
But, I have heard if you go cold turkey on the nappies it can take a week or more for them to get it. If it's only been 2 days you might find she's still working it out. Also, I've heard you should try not to whisk the undies off her after she wees in them - it's good for her to learn wet undies are VERY uncomfy and therefore it's worthwhile weeing on the toilet/potty instead. (This is something I didn't do with my DD - she was bigger and took her knickers off as soon as she wet/soiled them so she never got that lesson IYKWIM.)