Thank you for sharing your dreams with us. Please take everything that I share to the Holy Spirit as He Alone gives the accurate interpretation.
Your friend might be walking into or involved in a web of deception and/or witchcraft or experiencing something dark (could be demonic oppression/mental illness) of some sort. You will witness all of this but walk with her through the journey of recovery. The wig may suggest that she is putting up a fake facade, things are not as they should appear. Pray for her fervently.