I may be somewhat of a heretic, but I, unlike most others, see Jadis as sin and mainly its consequences rather than Satan himself. Digory awakened her by ringing the bell and he unintentionally brings her to Narnia where she flees to the north for a season. Digory didn't awaken the devil, but he awaked sin. Also in LWW, Aslan kills her. In our world, the devil wasn't destroyed after Christ's death. The total eternal consequence of sin was. Satan will be banished for 1,000 years, and then sent to the lake of fire at the
end of time. I thought for a while that Tash was the devil (which, in LB, it is most likely), but there is no eternal punishment on (him) at the end. Peter just commands that he leave. Hmm... maybe I'm looking too deeply into this.
"The master of that servant will come on the day when he is not looking for him, and at an hour that he is not aware of."
Matthew 24:50