I'm sorry to hear about that Beth! I hope you have a speedy recovery, all things considered. While I've been fortunate enough not to be able to relate to the broken bones, I've had lots of road rash and a broken tooth from crashes. My best advice is to be patient (easier said than done, I know), and to focus on the incremental improvements you make, rather than what still limits you.
Many years ago, I had a bad crash at 35 mph where I landed on chip and seal road, taking the brunt of the impact on my knee. I still remember the first time after the accident, when I could walk to the end of my parents' driveway unassisted to get the garbage can. It sucked that I had the accident, but I was happy that I could at least do that again. Try to look for little milestones and signs of progress like that. Just like mentally dividing a century up in to four 25-mile rides, it will make it easier to get to the end goal.
It might also help to keep in mind other riders who have had horrible accidents, and come back as good or even better than before. Dave Zabriskie comes to mind. He had a bad collision with a car, and it left him in a wheelchair for a while. I remember reading where he told about getting a friend to push him around outside, just so he could feel the wind on his face like with riding. He made it back, and you will too.
I look forward to riding with you in Lancaster next year - at least at the start, before you ride off the front of the group again! Save some ice cream for us at the finish!
PS - Although he's a bit far from you, you might want to check with Dr. Thomas Dickson in the Lehigh Valley. He has a lot of experience working with cyclists, including members of the Olympic team.
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The rider in my avatar is David Etxebarria, not me.