I've been thinking the same thing as Mel. Kristin, you mention pretty regularly that you think it might be time to end her suffering, which is a pretty uncommon statement from people around here unless their gut is really telling them that there isn't anything that they are able to do for their cats except extend their misery.
You're the one who is seeing Calley every day and who knows what your realistic limitations are for her care, whether they're due to financial, emotional, situational or medical reasons (which are all totally valid). From your responses to most suggestions, it sounds like several of these categories are fairly significant for you.
What does your gut say at this point? To you believe the efforts you plan to take could result in her feeling significantly better? Or do you believe that you're prolonging her discomfort? If you feel like your personal limitations for care are a significant factor, than re-homing could be a good option for all of you (including your kids).