Sark, I don't think the subtle approach is going to work here. This girl has the makings of a stalker and you need to give her a very clear message or she just won't get it. Don't worry about upsetting her - she will get over it.
I think she may be a professional stalker, so you gotta be straight with her Sark, if she don't get the message, you may well have to change your identity & move to another country!!!
It has the makings of a good film

Hope your keeping notes Sark, fame & fortune await.