I think that with all the stuff going on in her life it’s understandable that she’s not interested in writing right now. Since she’s crucial to the completion of the story, you can’t go on without her. So in the meantime, start something new, something that isn’t dependent on another writer. It will keep you occupied and you can work much faster by yourself too. Who knows, you might even get your work published and out there. Don’t wait for her before you write anymore.
In the future you can ask her if she wants to continue working on your shared project but I wouldn’t badger her about it now.
Whatever you do, don’t give up.