93!
From all my knowledge and experience the only way a person can put some sort of hex on you to gain control of your thoughts and reactions is if you let them. The only power they can have over you whatsoever is that you gave them by believing their stories and succumbing to your own fears. Many newbies fall prey to this type of energy vampirism because they do not yet know or understand the purpose and practices of True Magick. They've seen enough to know magick works but not enough to know how to use it, for what purposes should it be used, nor how much power they themselves possess already. They are open to this whole new world of both beautiful and terrifying possibilities becoming vulnerable to fictitious suggestions fueling their imagination which becomes prone to paranoia.
"In essence, yes. Problem is, the ego has limited power over subconscious drives, knots, obsessions, etc. Simply telling yourself she has no power will help, but if you believe, down inside, that other people are the cause of what happens in your life, then you've not wholly resolved the problem.
Banishing is effective in that it goes beyond the ego's own limits, and does more to marshal the powers latent in subconsciousness. "
I agree with Edward Mason here and he's right about this but I feel like you don't know a banishing. LBRP is great for all general clearing but you might need to find or create some kind of ritual/spell to release your mind, body, and space of the other's negative attachment. What worked for me (yeah, I've been in this situation a few times at least) was taking all photographs, notes, gifts etc. or if you have no personal remnants associated with them find/make an object, drawing, or find some image that's a strong representation of the person's entity.. Then burn it (in a flame proof container, outdoors preferably! Be calm, focused, and safe, not in a frenzy!) saying something like "Toxic fire away from my sanctity" fanning all smoke away from you. "leaving ashen wings to find true destiny." My favorite people banishing spell if you seriously need to remove a person from your reality is to (while picturing their face) say "God bless you, and God keep you, far, far away.."
I was taught this shield back when I was in my teens/early 20's when I suspected metaphysical attacks sent towards me: Visualize yourself surrounded by an amethyst crystal that becomes reflective like a mirror on the outside so that all who would harm you sees their own reflection knowing no one will not harm their own self (graduated version of I am rubber you are glue..) If you practice this shield everyday it will eventually be present without needing your attention. You can even strengthen this further by emanating love towards everybody as if you see your own reflection in them making it impossible to absorb any kind of negativity because you're constantly radiating a higher vibration that's powerfully expansive and harmonious to the universe. I know I'm sounding new age and hippie but it works to love your enemies...