I don't blame her either. There's so many other things she could do with her time! The ratio of women interested is a difficult thing to talk about because the "what should be done" about it is totally ambiguous and in my view, unproductive. And you very quickly start to draw imaginary lines around genders. But something I may suggest, and I only just realize now that this is what I did, is that she finds a voice that she likes in the bitcoin space, and chooses the meetup where that speaker will be as her first meetup. I think it could mean the difference and be one level more comfortable.