It's not that simple. These are elite athletes--I'm sure they all train very hard, and many of them do practice triple axels. If there currently exists an easy solution, they'd grab it in a heartbeat. But the human body does have its limits. This isn't just about the women, but the men too (hence why I'm not optimistic about 5-quad LPs being a reality).
In general, women don't have the jumping ability of men (with Midori Ito being the exception). But at the same time, I've noticed that the women tend to fall a lot less, since they have better balance. I'd like to see women should challenge hard jumps, and men work on having fewer splats, but it's a natural tendency we have to recognize.
I'm really hoping that with more training, female will be able to do quads. I love seeing females challenging males at stuff.