try the vitamins for a few days--maybe wry neck? I'm really not sure, but I think the vits wouldn't hurt anything and if she doesn't seem to be in any pain giving it a few more days would be ok too.
I hope she gets thru it ok. If you have any poly-visol on hand (infant vitimins-NO iron) you could put a few drops on the side of her beak to give her a little extra boost.
Do a search on botulisim (sp) I haven't had anything like that here, but I'm sure I've read about something similar and I think it may be botulisim. I'll check back later and try to find if for you if you aren't able too--Dinner and helping the kids with homework right now..