If your going to try spurs, definitely go for bumper spurs. Maybe just a little "umph" will get her moving.
When she's going around the barrel, is she lazy coming out of it? What's your explosion like coming out of the turn? Is she still lazy or does she do well. When my mare is lazy I carry a "popper crop", a crop that has a wide flat end so it makes a sound instead of leaving a welt on them like some over-unders will do.
If your having issues with laziness on that, I'll pop my horse just before reaching the barrel to push her into the pocket quicker, and then coming out of the barrel I pop her again to push her towards the next barrel. If I've riding a hard, fast pattern, I pop her between the barrels too.