I work with the missing woman's mother. Here's what I have learned:
She only had about 10 dives since being certified. Don't know how she was certified at this point. She was diving with her husband, who had recently been certified. Again, don't know how he was certified, either. She signaled to her husband that she was headed to the surface. As instructed by the DM, he turned to signal the DM that they were going to the surface. When he turned back to her, she was gone. Unknown if she ever made it to the surface. Based on the fact that they haven't found her, it's not likely that she did.
She only had about 10 dives since being certified. Don't know how she was certified at this point. She was diving with her husband, who had recently been certified. Again, don't know how he was certified, either. She signaled to her husband that she was headed to the surface. As instructed by the DM, he turned to signal the DM that they were going to the surface. When he turned back to her, she was gone. Unknown if she ever made it to the surface. Based on the fact that they haven't found her, it's not likely that she did.