Libby goes to the Vet again

I still don't think Libby is feeling/doing good. I tried and tried to get a urine sample to take in today but couldn't manged to do that. Much harder when you have two cats using the same litter box. I got something to put in the new clean litter pan but she wasn't interested. Anyone have any ideas on how I can get this done.
I am wondering if it's her mouth/teeth problem again. The vet said as much as she could see that didn't seem to be the problem. She gave her a steroid shot again today because she isn't eating again. I worry so when she doesn't seem to be feeling good. My friend went with me today to help me with Libby. I am driving again but not stable enough to carry Libby while I am walking.