This breed is extremely prone to disc problems in the spine and that is a good chance what the problem is.
You can read about disc disease here
http://uwveterinarycare.wisc.edu/sa_services/surg/neurology/ivdd.htm
http://www.veterinarypartner.com/Content.plx?P=A&A=2373
and about a fibrocartilaginous embolism to the spine here
http://www.marvistavet.com/html/body_fibrocartilaginous_embolism.html
Lots of info on paralysis and spine issues on this site put together by dachshund owners as that breed has this issue a lot
http://www.dodgerslist.com/
If it turns out that she cannot recover leg use there is the option of wheels for her to get around
http://www.doggon.com/home.html
http://www.eddieswheels.com/
http://www.dogkarts.com/
and info on building your own plus more
http://www.wheelsfordogs.com/
You may want to see if a vet at an emergency clinic can find the problem and start treatment. Or you may want to see your vet first thing when they open. You may need a referral to a veterinary neurologist for help and your vet can refer you if they think that is needed.
This site may help you locate an emergency vet if you need one
http://www.vetlocator.com/hotline.php
Hope this helps you!
Dog Expert:Rescue, Train,Breed,Care
30+ yrs dog home vet care & nursing, rescue, behavior&training, responsible show breeding, genetics