After a lonely night without Dolly and hearing Wren making a sad meowing sound often, Dolly was back home today.
Vet said Dolly is in good shape. Just waiting for the urinary tests to come back from the lab. The vet said he didn't see any signs of crystals in the urine and said the issue is probably behavioral. Dolly misses her fellow ferals outside and when she sees them and smells them it makes her pee, so have the rear curtains closed. He also told me to have a secondary litter box.
One other good report I got was Dolly was one of the best cat patients the vet has ever had. He was very impressed with how still she stayed while doing tests and never tried to run. Stayed quiet too and wanted attention in the carrier on the way home.