Focus on Inara last, aim for everyone else first. When needed, poison her and get a couple hits in, but make sure to move around so she has a hard time hitting you because her shooting time is slow.
Ying is able to teleport to her allies during her ult, so when she does try to kill her on sight. She can still have her ult going after she dies, but it can make it harder for the enemy to be healed. Also, remember she can teleport multiple times!
Find where her illusions are and use that to your advantage. If someone targets her, she will likely try to teleport away and confuse you. Surprise her by having someone else near her spot or quickly running after her while staying away from enemies
Try to place an illusion off to the side of the battlefield to teleport back to if someone, especially someone like Ruckus, starts to target you. This will work even if the illusion expires, but try to keep one hidden from the enemy at all times.
Try to stay out of his line of sight, and find where he will teleport back to so you can surprise him. Be prepared to hide quickly, because you can die very quickly to him. Try to pair up with others to minimize dmg taken and to kill him quickly.