If you do not find out what is wrong and get the proper treatment, just handfeeding will not pull her through.
I´m sorry I don´t have anything encouraging to say, but this is an emergency situation.
Absolutely an emergency situation. You must get her to a vet. Go to an emergency clinic if necessary. Once they´re at the state you describe, the illness has progressed far along and without meds is often fatal. She probably requires antibiotics such as Doxycycline or Bactrim. Pigs that young should not get Baytril. Print off the safe and dangerous meds (click on them at top of page) to give the vet in attendance if you are concerned about their level of expertise. Absolutely no penicillin-based meds - toxic to pigs.