Paganism teaches that. Her "proof" likely would have been some fraudulent junk that would have been a waste of time. However, I have also been caught off guard many times, and every Christian will experience this. We ought to keep preparing ourselves to face those times, and we have to learn to be temperate (even keeled; not quick to emotional reaction):
Know ye not that they which run in a race run all, but one receiveth the prize? So run, that ye may obtain. And every man that striveth for the mastery is temperate in all things. Now they do it to obtain a corruptible crown; but we an incorruptible. I therefore so run, not as uncertainly; so fight I, not as one that beateth the air:
-1Co 9:24-26
Paul's talking about shadow boxers vs real boxers. Real boxers are far faster and stronger than shadow boxers, which is why people who take on opposition on a regular basis are far more adept at handling even off-guard situations because they practice it. Even when I talk with a person who tells me they are a pagan, I listen to them and ask them questions, then I tell them what the Living God says about what they do:
Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
-Gal 5:19-21
The witches I've spoken with either get angry or uncomfortable. How to handle things from there just takes practice and experience.