Everyone is right, just be there for her. That is one of the best things that you can do. A friend who is there that does not think of her beloved kitty as just a pet is one of the best things that she could have. It will just take time, like any passing of a loved one.

Please relay my condolensces to her and give her a {{HUG}}. You are a very good friend to be there.

RIP Shakespeare, I know you will have a great time on the Rainbow Bridge with all of are friends.