How do you know that something comes from the Lord or from Satan?
Someone here has healing power. I believe God can give a Christian healing power. I feel strange about this woman who has this healing power but everyone else, including my pastor, believes in her.
God has given some Christians the ability to discern doctrinal error and false spirits. This is a spiritual gift or CHARISMA. The Holy Spirit may have given you this spiritual gift,
For to one is given the word of wisdom through the Spirit, and to another the word of knowledge according to the same Spirit; to another faith by the same Spirit, and to another gifts of healing by the one Spirit, and to another the effecting of miracles, and to another prophecy, and to another the distinguishing of spirits, to another various kinds of tongues, and to another the interpretation of tongues. (NASB) 1 Cor. 12:8-10
It can be difficult to discern false spirits sometimes. I would ask God for help in discerning if this women is from God or Satan. There are several biblical tests one must use. Here is a set of tests you need to use. Each of these tests must be true or she is false.
Finally, Jude gives us some advice that we need when we are dealing with false teachers and false spirits,
But you, beloved, building yourselves up on your most holy faith; praying in the Holy Spirit; keep yourselves in the love of God, waiting anxiously for the mercy of our Lord Jesus Christ to eternal life. (NASB) Jude 20-21
It is sometimes difficult to discern error and false spirits. If you have been confessing your sins, praying to God and studying God’s Word faithfully and you are still disturbed by this person, you must tell your pastor about your concern. If you have not been confessing, praying, and studying, I would start today and then evaluate her for awhile before I said anything. If this woman is in your church and you have already brought the issue to your pastor, then you need to faithfully ask God to remove her or change her heart. We will pray for you.