Update:
So on the 31st Aug I was all prepared to start TT with DD. We woke up, I showed her the new TT chart I had an explained when she does wee on the potty that she would get to put stickers on her chart and then if she fills it up she gets a "special". I got out some knickers, took off her nappy and she started screaming!! Did not want to put them on. She wanted to stay with no nappy and no knickers. I finally managed to get them on her and off we went. Every 30 minutes I told her "it's potty time" and i took her over to her potty which I put in our lounge room, I'd sit her on there. She just sat and played, read a book, or watched TV each time I put her on there. I kept asking her if she needs to do wee wee to sit on her potty. By lunch time she was a bit whingy and felt hot so I took her temp and noticed it was slightly up. Needless to say that Wednesday ended with 6 incidents in knickers and wet patches around the house, a 38.8 temp and a trip to the GP at 6pm after she broke out in a rash.

Thursday she got even more sick and had knickers on all day (only because she kept ripping her clothes and nappy off as she had a rash all over her which was majorly itchy) and she didn't wee all day. At 1am we ended up in the emergency department and got home at 5am. ANYWAY... So now she is finally all better (virus illness which they could not identify which gave her a very itchy rash on her limbs and face plus a serious dose of tinea in both feet just to top it off)..

So now unless I put a body suit on her with the snaps on it she is pulling off her pants & nappy during naps - even did it while my FIL was babysitting her on Monday and wee'd in the bed. Is doing it each night and we are having to re-dress her - put on a body suit - put her back to bed. Last night she cried so much that she didn't want the nappy so I let her choose knickers - which she played around with and I eventually forced a pair on again as she likes looking and picking them but not actually putting them on. 1 hour later she woke crying with a wet bed - which I did expect anyway but she insisted.

So my question is... 1) how do I get her happy to put on the knickers - I so was hoping it would be a better experience for her and she'd love all the novely pairs of knickers she has - she has "my little pony", dora, plain ones, bright colours, dorothy the dinosaur - all of them but doesn't want to put them on - likes to play with them though..
2) because she got so sick on our 1st real attempt to TT do you think she will be scared from the experience and 3) I know I have a BIG chance of lots of wee accidents again so tips on how to avoid it as last time she would sit on the potty and do nothing - then 5 minutes later wee her pants..

I feel like a crappy mother - she is the only little girl in her preschool class now who is not TT'd..

I'm wondering if I should wait for the school holidays when I'll be home all week and can keep her home from preschool to get her trained or just try it now with a different approach.

Is the "every half hour" approach a good idea?? Any other suggestions?