BMI is the best to determine health risk assessment
Appears radopaque on maxillary molar periapical radiographs and digital images.
I'm pretty sure I that it depends on the tide of the water. When it's low tide you can go deeper in the water when it's high tide you can't go that far without touching the ground
Well the best you can do is try to learn, or if she can read lips, then try to talk slow or make sure she's watching.
In terms of making her more comfortable, just repeat what you always do. if there's something she enjoys like certain activities, then recreate them each day.
I don't mean to sound condescending, but learning sign language isn't that hard, there are a lot of tutorials out there, and although they're just the basics, I'm sure she'd be happy that you're giving the attempt to communicate.
If you do try, remember that it takes time to get the hang of it, So don't stress or give up.