When my mom died a lot of people wrote saying that they didn't really know what to say or do, but for me to please know they're thinking of me. It made a huge difference. You more than just about anyone probably already know what a huge difference a friend can make. I'm sure you'll say what needs to be said, you always do.

Since you asked, no star-hugs-star for you, but plenty of respect for your caring and ability to share that, and your knowledge that even as you feel her death that you want to reach out and help someone else.