DD went through that exact thing too, luckily we have wooden floors....would have been a nightmare if we had carpets!!!
She started taking off her nappy and squating on stuff...like the tv remote!! and weeing!! I would take her to the loo each time and sit her there and explain thats where it goes! i taught her 'push' (complete with noises and faces...thank goodness no one else could see me ) and that really helped, took a while but inthe end i just said push and shed do her wees/poos!
i think by telling myself it didnt matter when or if she TTed helped. Now she still wears a nappy but will tell me when she needs to go and does most in the toilet. Good luck, and hugs to you!!