I think this is the one I'm thinking of. Buffy is stalked by someone (xander) who is killing girls who look like her. It was on sinister attraction but I can't get that to work for me.
Any help would be great. Thanks

It's available on EF. All her work was archived there recently.

Thank you. I could have sworn I'd already looked there but apparently not.

Sinister Attraction went down a few months ago but is still available here