Yuna would be well advised to compete at least once more before Sochi. It's expecting a lot of her to not hardly compete at all again and be like she was last season.
The important thing for Mao is have have beautiful landings on her jumps, and to focus on rotating her doubles so she isn't giving away easy points. The 3F she landed in the SP of the GPF had beautiful flow out, and that is how she will need to land her jumps to get the +1 and +2 needed to win.
This is probably her best shot:
Still very ambitious, but more "realistic" than two triple Axels or eight triples. It is both very difficult but also offers a non-zero chance of going clean.
Her most important strategy, though, is to go clean in the SP. She can't afford a mistake like last season's SP at Worlds.