Something you should always do is focus fire. If Ying has the Life Like Legendary Card, this is even more effective as the heal beam loses 30% of its healing ability, but if you spread out the damage, she will have 40% extra overall due to 2 beams.
As I said in my Willo vs. Kinessa tip, play carefully and keep moving. As a continuation of that tip, keep Flutter on as low of a cooldown as possible. You can also use your ultimate as a distraction play if necessary.
If an androxus attempts reversal don't go to counter stance instead just wait a small second and then whirl and go behind him. Whirling will surely damage him no matter what and then suddenly being behind will surprise him and allow you to takedown