Hi Michelle,
That's really interesting that your daughter was never fearful of water before. Was the teacher empathetic? How many kids are in the class? Is the pool really noisy? Perhaps the environment was overwhelming. My son went through that at the first place we tried swimming lessons. It was an indoor facility w/ two pools. In the second pool, there was a water aerobics class for seniors while his lesson went on in the other pool. Imagine a very loud voice saying, "And one and two and breathe and four...) reverberating throughout the facility! He was only about 18 months at the time, so I did hold off. Anyway, he just turned five, and we have been at a new place for around six months or so. It's a swim place that is only for kids, and there are only four kids per class. At first my son would sit on the top step in the pool and get weepy. However, the place gives kids ribbons for each step they reach in the swimming process. They get the first ribbon in the first couple of weeks, as soon as they stop complaining (for those who do) and are following their teacher's instructions. Well, as soon as my son saw the other three kids in his class get their first ribbon and realized that he would not get his until he acted accordingly, he shaped right up. No one ever berated him -- his swim teacher and we explained to him that he would get his ribbon when he was ready to do x, y, and z, and that we were proud of him no matter what, but that child wanted a ribbon! Within another two weeks he had his first ribbon (his lessons are once a week), and since that day he has been excited to go to swim class and has loved getting the chance to swim on vacation, etc. My non-professional advice would be to let your daughter know in a very empathetic voice (might sound silly but works) that you understand that she is scared and that many kids are scared when they first learn to swim and that you know how yucky it feels to be scared. And then, using these words (which I learned at a recent parent-child communication seminar), say, "The problem is," and then add your choice of problem, e.g., your friends are learning to swim and will start having swim parties and I want to make sure you can join them, or swimming is a very important skill to learn and will allow you to do lots of fun things, or whatever might be compelling for your child. You'll probably have to empathize with her for longer than you might guess before you get to "the problem is" because she won't be ready to listen until she senses that her feelings have been validated and not explained away or contradicted. Never say "but"! I would not suggest stopping the lessons because learning to swim is such an important safety skill. I would also make sure that the teacher praises your daughter's accomplishments. If your daughter sits on a step in the pool the whole time but does not cry, the teacher should tell her that she did a great job of being brave by sitting on the step. More than anything, your daughter may just want you in the pool with her, just like some kids have a hard time separating from parents at preschool and kindergarten. Be sure she knows where you will be during the lesson and what to expect ahead of time. A quick, fuss-free transition seems to work best if that's the issue. Best of luck.
K.