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.
The human body cells have 46 chromosomes because they inherit 23 from both parents.
The person you are sharing them with may be sick or have something and by sharing those they could pass it onto you
Yes it can memo and e mail are the best way to communicate