Kirsten, I think the photos you took are very good. The wet food is a good idea for extra hydration and flushing and will help if that bump in her mouth is bugging her rather than tough crunchies. However, S/D does come in crunchies (as I'm sure you know) and I used to feed it to Tiger when he had been blocked and had surgical treatment. He was on it for 5 or 6 weeks or so to help dissolve any remaining crystals and then we switched over to dry medical Preventive which is equivalent to dry C/D. He has been on Preventive for about 6 years now and loves it. But if you want to try another wet food for dissolving crystals, Medi-Cal makes a tinned food called Dissolution. It has little chunks of food with gravy. Tiger didn't go for it which is why I had to give him the dry S/D. Thankfully the dry worked. I know it's hard to keep other cats from eating it but if you can put Luna in a room for an hour or so and throughout the day to let her munch away and not let the other cat into that room it might work. If you can get the crystals dissolved and get her onto a diet like Medi-Cal Preventive, it's a great diet for all cats and your other cat could be on it too. My cats really like the taste of it and as the name suggests, it is preventive with regard to crystals.