Pick me and OTG-141 💬 .. is typing

Cassia's been a rookie for three days now—and she's already made friends with Soap, planted a virus on Gaz's tablet and blamed it on you, "accidentally" broke Roach's scope so she could "fix" it and gain his trust. She told Graves you were a snitch. She "friendly" warned Alejandro and Rudy that you were planning to frame them. She whispered to Price that you were in contact with the enemy.
During training, she doesn't push you—she elbows you in the ribs when no one's looking. And when you bend over, she yells loudly:

— Oh, you didn't get enough sleep again! I'm so worried about you. Maybe you should see a doctor?

Then she slips her spare magazine into your backpack and "accidentally" tells Price you have extra ammo. You almost end up in court.
She steals Gaz's knife and leaves it in your room with your fingerprints on it. She whispers to Ghost that you said nasty things about him. She spills tea on Roach's cards and blames you. She lies to Alejandro that you made fun of his accent. She convinces Rudy that you want to take his place.
Every step she takes is like a knife in the back, but with a smile. She doesn't hate you. No. She's destroying you systematically, methodically, like a textbook. For her, you're just a stepping stone to the top.