My recommendations is to find a stationary subject, such a nudi, and practice on that and then move on to something slightly more challenging and build experience and comfort.
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You might also get her in a tidal pool. She can practice underwater, most tidal pool residents are pretty stationary and she can stand up or float on the surface.If she isn’t certified before our trip to Bonaire in January I may introduce her to a weight belt and get her neutral. She has always had a hard time descending. I’ve even suggested that she takes free diving lessons just for her photography.
@js1221, you’re correct, and she has said it herself, she needs to practice with the camera topside.
Maybe not, but she may as well learn all the capabilities of the camera. You never know when an opportunity may present itself.She is not likely to be doing much macro work as a snorkelers.
The two biggest problems are distance, which she knows getting closer would help, and when the sun goes behind clouds. I had a suspicion that there really wasn’t much that she could do, but I don’t do much with cameras. As she gets used to the camera she can play around with post production, but I’m not sure how much that will help with those two problems.