Hey L.,
My daughter went through this as well.
Who knows, maybe she'll go through it again!!
I THINK what happened was that one time the water was a little too hot. She remembered this and started freaking out when it was bath time. We did sponge baths for a while and then I did the following:
I took a bath in front of her - yep, I drew the bath, undressed (would only do this with a young child, of course!!), and jumped in the bath. I asked her to hand me the toys and we played - me in the bath, her outside the bath. I sang songs and talked about how much I loved taking baths. I did this for three nights in a row, always asking her, "do you want to join me?" She finally said, "yes." So, I got in with her for about three or four nights. When I began to notice that she was happy in the bath (at first, she was a little hesitant), I suggested she go in by herself. She said, "OK." and since then she's been fine.
Don't know if this will help, but thought I'd pass it on!
If your daughter absolutely refuses to take a bath, I'd just stick with sponge baths. I can actually get my daughter cleaner with sponge baths!! When she's in the bath, she gets caught up playing with her toys and I'm constantly trying to keep her still long enough to rub her clean : )
Good luck! M.