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!
If Skye attempts to use her ult next to you, quickly bring up your wall (impasse) to shield yourself. This might not always work, but bringing up your wall + earthen guard can make sure you survive and stay on point. Placement is key!
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.
If he has his shield larger with his talent, try to stay on the side they are on without them knowing. This makes it easy to hit them because his shield only stops attacks from the front. (if you are a tank, keep pushing them back past it to hit 'em)