Well, this was a huge failure. I edited her xml file to include all 80 dive sites that are in my ssrf file. The first time I opened her xml file in Subsurface, all those dive sites were there. I was able to add dive site locations to a few of her dives without entering the name and coordinates manually.
But, once I saved the changes, Subsurface deleted all of the dive sites that were not actually her dives. So, instead of 80 dive sites her xml file now has only three.