To be fair, in the heyday of zines, fanfic was much less widely known, mostly to people who attended cons and the like (and this was pre-ComicCons, DragonCon, etc. before the geeks had inherited the earth) so the number of stories written was also probably significantly smaller than what you'd expect? I remember zines like Warped Space and some of the Trek and Star Wars zines, but back in the late 70s/early 80s, there weren't a ton of zines out there. I didn't really pay attention to original BSG zines because the show didn't click for me and I quit it pretty early on, so I don't have a sense of the volume.

If someone had access to Susan's stories, they might be able to post them -- I wonder who her executor was and whether they were aware of how prolific she was as a writer.