Yes, any edible oil will do.
I guess maybe prepare a litre of the yoghurt / oil / ginger mixture, then split it, add the bicarb to one half and feed that, see what happens. Do the other half if it seems like it's helping.
If you don't have yoghurt to hand (probiotic is best, of course), and can't get any straight away, then I agree with twizz, get the vet. The animal is clearly in distress, and if the rumen has stopped working you need to get it going again pronto.
Other things I might do is pen her on her own on clean straw, next to other sheep but so that you can see if she's pooping and peeing. If not pooping, check that there is a proper anus, and give paraffin, which would help to shift any blockage.