DD1 is 3.5. We left it quite late (over 3) to try potty train (was hoping she'd be one of those who one day announces they're going to wear pants and is dry from then on - I know, I know, it was stupid 
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Anyway she's in pants all the time now, and has gone over a week in the past with no accidents so I know she can do it. We really praise anything done on the toilet.
The problem is she just doesn't seem to want to actually use the toilet. For instance, the other day we were in the kitchen and she went "ooh, I need a wee", then went and sat cross legged on the carpet and did one. Yesterday she was sitting on the sofa and started pointing at her bits and she was sat in a puddle. She's wee'd twice in the last week on a lovely fabric ride on caterpillar, twice on the sofa, on an armchair and on a window seat cushion. Recently we were at a soft play place and another mum came and told me that she'd weed in the play bit and just stripped off from the waist down and carried on playing.
Encouraging her to act 'like a big girl' doesn't work - while we were training her she'd say she wants to wear a nappy and be like a baby. I've tried telling her that I don't want a baby I love her as a lovely big girl etc.. I've tried totally ignoring her for 5 mins after she wees, she doesn't like it much but it hasn't solved the problem. She doesn't like wearing wet things but will take them off herself (in public) and happily run around naked.
We've tried a sticker chart and the promise of going on an adventure day out if she can go a few days without an accident. Neither really worked.
When I first trained her we gave her some chocolate every time she used the potty. This reached a stage where "poos mean chocolate mummy" which isn't where I want to be but it's starting to sound like a good option.
I think it's an attention thing but I really do try to praise the good behaviour and ignore the bad. Mayeb I just need to try harder????
Any thoughts???