I'm willing to bet she didn't....seems like running for her was social.
Running half marathons is not a social event (in my opinion). It requires a certain level of dedication and training that doesn't always match up with running with others. I've run in pouring down rain, snow/ice, 15 degree weather with 30 mile an hour winds, 100+ degree temperatures, and every other scenario you can think of. I've run 6 miles on New Years day after puking my brains out from over indulging the night before. I've run when sick, when tired, when hurt (like I am now) because it needs to be done.
Now I also always run alone, so I have a different perspective. But I can't believe she NEVER ran alone.