I do not know much about treating goat anemia but I would think you would want iron, rather than the B vitamins (if your goat has polio, then I know the B complex is an alternative to straight thiamine if you can't get a vet right away). Hopefully an anemia pro will be along soon (20kids I think has some great posts on treatment and you may want to do a search for it). How do you know she is anemic?
WE use the B-complex along with a shot of Pig iron. The pig iron can only be given one time every 3 or 4 days at the most, but the B-complex can be given daily or even a couple times a day.