A.L.I.E. takes full control of Raven to stop the group, using her to verbally tear apart each character's insecurities. This "breaking speech" highlights their darkest deeds: Bellamy’s role in the massacre, Clarke’s decision at Mount Weather, and Jasper’s ongoing grief over Maya.
Once free, Raven reveals that the "second AI" (The Flame) is the only thing capable of stopping A.L.I.E.. Watch The 100 S03E11 1
Using a salvaged wristband from season one and the EMP, the group successfully shorts out the chip. Clarke uses her knowledge as a "Flamekeeper" (learned from Titus) to surgically remove the liquefied remains of the chip from Raven’s neck. Why It Matters Clarke’s decision at Mount Weather