barbarian, sorry I should have asked how meg was as well. Been up since silly o'clock and hadn't switched my brain on when I posted.
I'm so sorry to hear her face is swollen. Was there any sign of blood? If there was I would say she is an emergency, as dog bites can get infected very quickly and could be at the root of the swelling. It's always better safe than sorry with dog bites.
We just met a young Labrador in the park that my two have met lots of times before and was always really confident and such a happy wiggly girl. We haven't bumped into her for a while and now she's really worried and submissive. Her owners are lovely, but never have her on a lead, so I'm wondering if she's had a bad experience too. Couldn't really stop to ask as she was clearly worried about Lurcherboy saying hello, so I took both mine away sharpish. Lurcherboy was so pleased to see her and really confused by her reaction. They used to play so well together as well. 
There seem to be so many more dogs that will actually start a proper fight around these days than there used to. In over 20 years of owning dogs I've never heard of so many dogs getting attacked - let alone puppies, who adult dogs usually tend to give some leeway to, even if they are a bit rude and in your face.
More owners who don't seem to care either. Can't believe that guy lets his spaniel off, let alone near pups if he knows she's nasty. 
Poor Meg. I hope it does turn out to be some localised bruising and she's better soon.