Daughter won't wear underwear

Dr
So my kid hates the potty training thing. She's three almost four (ridiculous I know) and we havnt gotten anywhere up until two days ago. Tried every trick in the book, In the past she didn't care if she had an accident, she would just carry on as if nothing had happened leaving me go discover a puddle on the floor later. She has told us that "diapys are better" and really likes pull ups and she tends to use them like a diaper. But two days ago she started to care. She wet herself and got upset about it and told us (a little to late) that she had to go potty. Huge progress! 
But now she doesn't want to wear her underwear And wants a pull up. Yesterday I compromised and let her go around naked, but she yet again didn't care about her accidents. So today I forced the underwear on and she threw a fit about it and is now just laying around refusing to get up and play.
Did I make the right move here? Should I just let her be naked again? Are there any other options?
I don't want her to resent underwear. But at the same time the fact that she cares is huge.