K.G.
Hi K.. I went through the same thing when my daughter was about 3 years old. I finally sat down with her on my lap and asked her why she didn't like bathtime anymore.....it came down to something so simple as she was afraid her bath toys were going to get sucked down the drain! :) I took her in the bathtub when there was no water and we played in the tub and I showed her that none of her toys would fit down the drain. We tried and tried to get them to go down the drain and none of them would fit.....after that she was back to her regular bath time schedule and loving it. Just be patient and talk to her about it when both of you are calm and not stressed out about it. This too shall pass and good luck!
Take care,
K.