Her name was Jael, wife of Heber a Kenite.
Sisera thought he was in safe territory.
He could not hide from God!
"But Jael, Heber's wife, picked up a tent peg and a hammer and went quietly to him while he lay fast asleep, exhausted. She drove the peg through his temple into the ground, and he died."
(v.21)

"And the hand of the Israelites grew stronger and stronger against Jabin, the Canaanite king, until they destroyed him."
(Judges 4:24)