I realize that this topic has been covered (probably many times) before, but here is my situation:
My fiancè's sister has before her, some unique challenges.
Firstly, she is handicapped (by her own definition) prior to sustaining a traumatic brain injury.
I did not know her prior to this injury, so I cannot speak to how she was prior to her injury in terms of personality, personal habits and her interaction with other people.
She is a lovely person and I do like her very much.  
I would appreciate her company even more if she would refrain from touching me.  
When I say "touching me", I mean that she hugs, touches my hair, caresses my arms/ shoulders/ back, and basically follows me around until I'm cornered to again hug & kiss me on the cheek.  
I am a compassionate & empathetic person which means that I have kept this under wraps, about how I feel but it has now reached a point where a simple visit turns into a source of considerable stress for me.  
I so very much wish to know how to get this across in a kind & polite way without hurting any feelings.  
Anyone with some constructive advice, please reply.
Again,  I cannot and will not be anything less than gentle and kind:  I will try my best to avoid hurting any feelings.
Thanks to any who respond!