It's a pretty bizarre situation. I have been searching news reports, and here is what I have seen. If nothing seems to make sense to you, don't blame me.
- a head count after the dive revealed she was missing.
- divers were put in buddy teams before the dive. After the dive, a person said his/her buddy was missing.
- A search found her scuba equipment.
- Shortly after, the search found her without any of her scuba equipment, but with her weights.
- She apparently did not speak English.