I've been wondering if this is the injury that ARC was treating her for when she first came in as part of the Wastelander Project. But then she really wasn't on her own (Milo!). I don't actually expect you to verify or correct my question, I imagine it'll be revealed eventually.
One thing I really appreciate about your comic is how you represent your female characters. They're treated like people. No pinup artwork figures, barely there clothing, or perfect Godiva hair- long and loose and hazard-in-waiting. Jenny's hair and clothes are crap right now (in the image) and she's got a very nonsexy expression on - realism ain't just for the male characters people.
I haven't even mentioned your skills as a writer.