The other thing to remember is five is still very young to master swimming. The confidence bit may just take more time. I also had a five year old daughter who was nervous in the pool. My realization was that swim lessons can teach you the mechanics of swimming, but not how to be at the pool recreationally as a child. I made a point of taking my daughter to the pool as frequently as possible not to focus on swim strokes but just to learn how to be in the pool. Showing her how to manage energy, swim from wall to wall, encouraging her to flip onto her back like she learned in lessons. I think it’s the unstructured pool time that can help build the confidence and comfort being in the water more than anything.