By the time you receive this owl, I will have already sent the hit wizard detail requested. Your concerns are matched by mine and Gaskin's, and whether your brother feels he needs protection or not, it is my duty as minister to make certain he is safe. If he takes issue with this, I will encourage him to take it with me and not you, as this decision was mine.
As for your own safety, while your skills are much to speak of, I would caution you to take extra care. While this person may have let you go for now, I'm not convinced that she will not seek to finish what she started at a later date.