Please google IVDD (Intervertabral Disc/Disk Disease) & read as much as you can......Your dog should be on strict cage rest for at least 4 weeks...She should NOT be moving around on her own! Only carried out to potty & then back in to the cage.....4-6 weeks is the normal protocol to allow for the disk rupture to heal......This will be your best chance for her to walk again...There also is a surgery, it should be done in the first 36 hrs. of paralysis for the greatest chance of recovery......
Again, please study up on it & read everything & get her in a crate!!!! ......good luck......Karla
Did the Vet even take x-rays to try to diagnos this? I question the treatment without a diagnosis.
Since you have a small dog, I would try aquatic therapy. If you have a bath tub fill it with enough tepid water so the dog cam swin, make a sling out of something to hold her and let her try to exercise in the water for maybe 10-15 mins once or twice a day. Limit her activities and no stairs.
Did this with my aunt's Doxie years ago and it did help over time.