There are two things that I would do...
Reach out via a text or send a card, simply saying, "I'm here for you, if you ever want to talk (or not talk), and simply want company. I'm here".
And then let it be. Maybe you hear from her, maybe you don't. In the end, it's her choice. She may be at a point where she just needs some space and some silence, away from all the sympathetic eyes reminding her of her loss.
You simply re-establish your willingness to be there for her, and then let her make the next move, if she chooses.
The second thing is, what about private celebration of life for this wonderful friend, with just your DH and DD? Bring it up, and then let DH choose if this is something he might like to do.
A celebration of life doesn't have to be a one-and-done, for that matter. For fifty years, there has been a Stephen C Smith Memorial Regatta in Shell Point, FL. It's a windsurfing regatta that raises money for the American Cancer Society. I volunteered in the mid-1990s when I was living in Tallahassee, and it was a ton of fun. ESPN covered in on television in the 1990s, not sure if they still do. It was something that started small, and has now become something of an institution to honor a man I never met, but who posthumously gave me some wonderful, lifelong friendships and incredible memories. I'm hoping to get back this year for the 50th anniversary celebration.
Maybe in a few years there might be an annual Pickleball Tournament in honor of your friend, that is a benefit for cancer research or something that was important to your friend.