Using Nimble as an Item is good against Cassie. The player will have to review his/her shots trajectory to make sure to hit you with your different movement speed.
In the start of a round, go near the objective but stay behind and wait for around 5 seconds, then use Scout to determine which way Skye will flank.
This also directly counters Stealth.
Kinessa's reload is fairly long, letting Maeve pitch damage in for free while you're reloading. If she's the only flank around and your team has other offense items covered, you could grab Deft Hands to help out an engagement.