I will tell you my secret to changing baby habits if you promise not to contact DYFUS on me!!! hahaha
My older daughter who is now 12 used a pacifier until she could speak in full sentences, 4 syllable words and could read a book. I was embarassed and frankly concerned on why she needed to cling to this little habit. We tried everything we could think of but other family members would think it was cute and send her the darn things in the mail as gifts! One day we were down to one lonely pacifier so I hid it. She screamed and cried and her father couldn't take it anymore. We pulled into a store and I ran in to buy a new one. I decided to pick up a newborn pacifier in really cool colors. When she tried to go to sleep sucking on this thing it kept flying out of her mouth because the length was just too short! hahaha I have really never laughed so hard.
I decided to apply this same concept to potty training my now 3 year old daughter who is over 45 pounds and 42 inches tall (that's a whole other story!). I was frustrated with her refusal and the fact that she constantly was uncomfortable with not really fitting into the size 6 diapers or pullups I found. So I decided what day to start and bought a smaller size 5. Two days went by and I bought a size 4, then 3. Each day when she complained I said "Boy, these diapers seem like they are for tiny babies, don't you think? You must be growing into a big girl now. Want to try using the potty instead and wearing underwear?" After about a week and a half and slight irritation and a rash on her hip from the snug diaper, she quit cold turkey like it was all her idea!!!
Its been about 5 weeks and she has had one overnight accident and I save about $40 a month on diapers, cream and wipes!
So maybe your daughter won't like wearing a diaper-thong either!!
Good luck!