I would definitely give her a shot of Combivit, 5 to 7ml into the muscle. It can't do any harm and if she is short on vit B it will help.
I have found with my goats that a shot of an NSAID, like Metacam or Flunixin, will also perk them up, just a painkiller, but has done wonders for really quite listless (and sick) animals for me.
Unless you have either of them to hand, you may have to get the vet out.