dyed, I found those, but didn't know if they'd work. With the size of her frame, it was my thought/feeling that it would be difficult/impossible to fit a caliper in there.
watts, I believe keeping the rim brake out back is the best option. She loves the frame, and has ridden nothing else since it was new. The suspension fork that is on there will accept a disc setup just fine. I have ridden ONLY carbon forks w/ discs for a long time. My buddy and his wife are believers in suspension. I've been trying to convert them for a long time, so I don't see them switching forks.
I think I'll advise them of their options, and I think I'll advise them to keep rim brakes on both ends. I think they'd entertain a new bike if she didn't love this one.
Thank you for the help.