Please! My cats particularly sick?

My cat is 14 years old. I believe she has some type of arthritis because when we took her to the vet she gave her a shot of cortisol and she be great! However she was really sick again within three days. We got prednisolone and the vet told us to endow with 5 mg twice a day every twelve hours . Im scared because right now she cant even move her boss. Would it be a stupid idea to give her a moment dose before the twelve hours?
You need to call the vet ASAP!
I can see you care for your cat, don't confer her the second does because you don't know if it will positively or negatively change her movements. Call the vet right away, and tell her what's going on. First, breath, relax for a second or two. I can see you're amazingly stressed, don't worry hun, everything will be fine.
Answers:    Prednisolone is an anti inflammatory medication. Do not give more than prescribed and do not give it more frequently.
There is a kismet that your cat need to see another vet if she is getting worse.
DON'T GIVE HER A SECOND DOSE! CALL THE VET!
How long has it been since you give her the last shot? The vets do give the dosing schedule for a reason...
No! Do not administer a moment dose. Contact your vet immediately!
Blood contained by my Kitten's Stool?   How do you bring back your cat to quit going pee on the laundry when the litter box is verbs?   Aren't animals supposed to know when to stop ingestion? ?   OMFG!! 5 mo frail kitten contained by warmness every 2 weeks?