It sounds to me that even offering her “friendship” will do nothing but cause problems for you. Unfortunately this girl is probably going to see any type of friendliness or attention from you as “a step in what she feels is the right direction” Of course she can not get this attention if she does not make herself “available” at any given chance. Now I am assuming she is stalking you more like “obsessed” meaning finding out when and where and showing up at the same places you are going all the time...If this is the case my best advice would be to just simply ignore her… literally act like she does not exist. Be careful not to smile her way try not to make any eye contact. And if you really want to give her the hint…. Start bringing some dates around…If your at a night club ask other girls to dance….or a party find another girl to get cozy with….never making eye contact with miss obsessed during any of this… she may just think your trying to make her jealous and be up to the challenge. Now I said all this assuming she is just a foolish obsessive girl. If I am off base here and we are talking the kind of stalker that might sit in a car outside your home day in and day out…. Or be waiting in parking lots and so on so forth. Then First of all do not do anything I suggested above! You don’t want to tick this one off! In this case you really have a problem that no one on here can help you with… this would mean she is psychotic. Very scary situation. Because of their abnormal thinking and perceptions. If she is a psychotic stalker you would need to get the authorities involved. Oh an by the way any woman that doesn’t know how to take the hint is obviously not all there. So no matter what you do… tread lightly. If you begin to feel she may be a threat in any way… do not let it ride….it may be time to get verbal… and possibly protection.

then perhaps you should tell her that.

You gotta tell her exactly that. "I don't like you as more than a friend. And that will not change" You gotta be straight and forward. Leave no room for her to have hope that in the future you might change your mind. And then get on with things. Of course if it gets too bad, there is a little friend I have called 'The Restraining Order' =) used in desperate cases only.