You need to lay off her. Just because you don't get it, doesn't mean she has no basis for her statement.
Those IN CHRIST Jesus are indeed "perfect and complete".
Colossians 2:10 And ye are complete in him, which is the head of all principality and power:
Colossians 4:12 Epaphras, who is one of you, a servant of Christ, saluteth you, always labouring fervently for you in prayers, that ye may stand perfect and complete] in all the will of God.
In fact, it's the only way we can fulfill what is written here.
Matt. 5:48 Be ye therefore perfect, even as your Father which is in heaven is perfect.