Happy Guy said, Edit: Woops just noticed you're female. Okay disregard the stuff on the sexual harrassment as it pertains to the hugging stuff.
I would not disregard that possiblity in this day and age.
You need a third party that is impartical to be nearby anytime she comes around. Does not mean that they have to sit down with both of you. Never let the door close if it is just the two of you. Do you have a conference room with glass that anyone passing by can see in.
I would never go out alone with her. Only go in groups and make sure you leave before the group leaves.
Something does not sound right here. Why aren't the other JWs that work there preventing her from coming to you.